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Many sites have a generic logo - a speech bubble in the SE brand color containing an abbreviation for the site. This speech bubble motif also continues in some of the custom logos.

Site Logo Site Topic What the logo represents
Academia Academia logo academia Books
Android Enthusiasts Android Enthusiasts logo Android The Android logo, though slightly changed to look like a speech bubble
Anime & Manga Anime & Manga logo anime and manga Based on the stylized kanji for
Arduino Arduino logo Arduino An infinity symbol, based on the Arduino community logo
Arqade Arqade logo videogames and videogame consoles The Iconic ship from the game Galaga
Artificial Intelligence Artificial Intelligence logo artificial intelligence A fingerprint, possibly related to biometrics authentication, a common application of AI
Ask Different Ask Different logo Apple hardware or software the Command key found on Mac keyboards
Ask Patents Ask Patents logo people interested in improving the patent system
Ask Ubuntu Ask Ubuntu Logo Ubuntu A speech bubble in the Ubuntu primary brand color (co-designed by Canonical, the speech bubble was part of the design guidelines)
Aviation Aviation logo aircraft pilots, mechanics, and enthusiasts An aircraft attitude indicator
Bicycles Bicycles logo people who build and repair bicycles, people who train cycling, or commute on bicycles A head tube badge
Biology Biology logo biology researchers, academics, and students A stylised DNA double-helix
Blender Blender logo people who use Blender to create 3D graphics, animations, or games The logo of the Blender software, but slightly changed to look like a speech bubble
Bricks Bricks logo LEGO® and building block enthusiasts A 2x2 Lego brick, a very common piece that is in over 3,000 sets. Discussed here
Buddhism Buddhism logo people practicing or interested in Buddhist philosophy, teaching, and practice A Dharmachakra or Wheel of Dharma
Chemistry Chemistry logo scientists, academics, teachers, and students in the field of chemistry A ball-and-stick diagram of Benzene
Chess Chess logo serious players and enthusiasts of chess a rook (one of the chess pieces)
Chinese Language Chinese Language logo students, teachers, and linguists wanting to discuss the finer points of the Chinese language 「漢」 The first character of the name for the Chinese script「漢字」or Chinese language「漢語」
Christianity Christianity logo committed Christians, experts in Christianity and those interested in learning more An encircled Western Christian cross
CiviCRM CiviCRM logo administrators and users of the CiviCRM Constituent Relationship Management software An adaptation of the CiviCRM logo
Code Golf Code Golf logo programming puzzle enthusiasts and code golfers An award medal
Code Review Code Review logo peer programmer code reviews A magnifying glass looking at greeked code; the magnifying glass itself looks like a C and R, although some people see a Q, perhaps for “question” or “(code) quality”
Computer Science Computer Science logo students, researchers and practitioners of computer science a rooted binary tree
Constructed Languages Constructed Languages logo designers and users of artificial or invented languages, consciously developed instead of having developed naturally The ISO 639-5 code for constructed languages
Craft CMS Craft CMS logo administrators, end users, developers and designers for Craft CMS The Craft CMS logo
Cross Validated Cross Validated logo people interested in statistics, machine learning, data analysis, data mining, and data visualization Inspired by k-fold cross-validation
Cryptography Cryptography logo software developers, mathematicians and others interested in cryptography Other than the letter C, it has elements of Lock, Key, Vault, Puzzle
Database Administrators Database Administrators logo database professionals who wish to improve their database skills and learn from others in the community A UML-style symbol for a database
Drones and Model Aircraft Drones and Model Aircraft logo experienced flyers, pilots, and builders of drones and model aircraft UAV stands for Unmanned Aerial Vehicle, an alternate term for the subject
Drupal Answers Drupal Answers logo Drupal developers and administrators A simplified Drupal logo
Electrical Engineering Electrical Engineering logo electronics and electrical engineering professionals, students, and enthusiasts The circuit symbol for a diode
Emacs Emacs logo those using, extending or developing Emacs The letter e encapsulated in parentheses
English Language & Usage English Language & Usage logo linguists, etymologists, and serious English language enthusiasts A cursive (old-style) ampersand
English Language Learners English Language Learners logo speakers of other languages learning English a bookmark
ExpressionEngine® Answers ExpressionEngine® Answers logo administrators, end users, developers and designers for ExpressionEngine® CMS "... an icon mark, which reflect[s] the idea of a construction project: you always start with a plan or a schematic (the outlined E) of how something needs to be built. Then, as the project is finished, the final form (solid E) is what is seen by people for all time."
Game Development Game Development logo professional and independent game developers Three cubes
Geographic Information Systems Geographic Information Systems logo cartographers, geographers and GIS professionals A compass
Graphic Design Graphic Design logo Graphic Design professionals, students, and enthusiasts The logo represents the creation process of a logo itself, with sketch lines still being visible, circles, squares and triangles being the basic shapes of any graphic design
Hinduism Hinduism logo followers of the Hindu religion and those interested in learning more about Hinduism Om
Home Improvement Home Improvement logo contractors and serious DIYers A cross-head screw
Information Security Information Security logo information security professionals The shield represents defense; “the lion […] symbolizes strength and valor; the wings represent swiftness and protection”
Japanese Language Japanese Language logo students, teachers, and linguists wanting to discuss the finer points of the Japanese language The first letter of the Japanese hiragana alphabet, which is the equivalent of the romanized letter A (meta post proposing it)
Magento Magento logo users of the Magento e-Commerce platform "...logo which captures the essence of Magento's logo, but is still unique to the community."
MathOverflow MathOverflow logo professional mathematicians A minimized version of the full logo, which consists of the name of the site with a visual indication of “overflow”
Mathematica Mathematica logo users of Wolfram Mathematica Inspired by Wolfram’s Mathematica logo, but modified due to copyright reasons
Mathematics Mathematics Stack Exchange Logo math visually represents 6 cubes, whereas the design was made by Jin discussed from this meta post.
Meta Stack Exchange Meta Stack Exchange logo meta-discussion of the Stack Exchange family of Q&A websites An empty Stack Exchange logo
Mi Yodeya Mi Yodeya logo those who base their lives on Jewish law and tradition and anyone interested in learning more Inspired by the Tree of Life, subtly includes the Star of David (a popular Jewish symbol), and a question mark (with the dot being the o of Yodeya)
Movies & TV Movies & TV logo movie and TV enthusiasts Popcorn
Music: Practice & Theory Music: Practice & Theory logo musicians, students, and enthusiasts Piano Keys
Network Engineering Network Engineering logo network engineers Symbol for a router
Personal Finance & Money Personal Finance & Money logo people who want to be financially literate A piggy-bank
Photography Photography logo professional, enthusiast and amateur photographers A Polaroid photograph
Physics Physics logo active researchers, academics and students of physics The "Mexican Hat" potential
Poker Poker logo serious players and enthusiasts of poker A club (card suit)
Puzzling Puzzling logo those who create, solve, and study puzzles Lock + Impossible Geometry; “Lock” represents riddle, mystery, and discovery; “Impossible Geometry” represents complexity, (almost) impossible to solve, mathematics
Quantum Computing Quantum Computing logo engineers, scientists, programmers, and computing professionals interested in quantum computing Logo with no discernible connection to quantum computing, adopted with no consultation with the community. (Possibly related to the logo of Strangeworks, the sponsor of the site.) Replacement proposals are being discussed.
Raspberry Pi Raspberry Pi logo users and developers of hardware and software for Raspberry Pi Based on the Raspberry Pi logo; “Raspberry which symbolizes community roots and the device which is a foundation for everything you build [and] Circuit boards which are the main theme of the site”
Role-playing Games Role-playing Games logo gamemasters and players of tabletop, paper-and-pencil role-playing games a 20-sided die
Salesforce Salesforce logo Salesforce administrators, implementation experts, developers and anybody in-between The Salesforce logo (a cloud with lots of connections inside)
Science Fiction & Fantasy Science Fiction & Fantasy logo science fiction and fantasy enthusiasts A rune circle
Seasoned Advice Seasoned Advice logo professional and amateur chefs A toque blanche (chef's white hat)
Server Fault Server Fault Logo server, networking, or related infrastructure administration There is no meta post associated with this logo, so presumably, it represents a server rack.
SharePoint SharePoint logo SharePoint enthusiasts The nodes represent the six functions. The cube formed by the nodes and the connecting lines convey the idea that SharePoint is a whole service package. The flow bounded inside of the cube also forms an "S."
Signal Processing Signal Processing logo practitioners of the art and science of signal, image and video processing A wave sign
Skeptics Skeptics logo scientific skepticism Based on Wikipedia's [citation needed]
Software Engineering Software Engineering logo professionals, academics, and students working within the systems development life cycle A cup of coffee. Essential part of every software engineer life.
Software Recommendations Software Recommendations logo people seeking specific software recommendations two symbols combined: a "cog (as a metaphor for software, tool, program or app) and compass (as a metaphor for guidance)"
Spanish Language Spanish Language logo linguists, teachers, students and Spanish language enthusiasts in general wanting to discuss the finer points of the language the letter ñ, typically only found in Spanish
Stack Apps Stack Apps logo apps, scripts, and development with the Stack Exchange API A gear
スタック・オーバーフロー スタック・オーバーフロー logo 熱狂的でプロフェッショナルなプログラマーのためのQ&A See Stack Overflow
Stack Overflow em Português Stack Overflow em Português logo Perguntas e respostas para programadores profissionais e entusiastas See Stack Overflow
Stack Overflow en español Stack Overflow en español logo Preguntas y respuestas para programadores y profesionales de la informática See Stack Overflow
Stack Overflow на русском Russian Stack Overflow Logo practical programming problems in Russian Russian language version of Stack Overflow. To distinguish it from other versions, the logo background is set to Dark Blue.
Stack Overflow Stack Overflow Logo practical programming problems A stack of papers overflowing from an in-tray
Stellar Stellar logo developers and users of Stellar and the Stellar Distributed Exchange The official currency code for the Stellar Lumen (see Tezos for reference)
Super User Super User Logo computer software and hardware an ASCII-style face.
TeX - LaTeX TeX - LaTeX Stack Exchange Logo TeX, LaTeX, ConTeXt, and related typesetting systems A pair of braces, ubiquitous in the TeX world, represents a group, so the official logo {TEX} is a word play that means “TEX group”. The icon { } is a short form of that.
Tezos Tezos logo users, experts, and developers of the Tezos blockchain project The official currency code of Tezos.
The Workplace The Workplace logo members of the workforce navigating the professional setting An origami letter O
Theoretical Computer Science Theoretical Computer Science logo theoretical computer scientists and researchers in related fields a deterministic finite automaton
Travel Travel Stack Exchange Logo travel-related questions three overlapping pins as discussed in this meta post.
Unix & Linux Unix & Linux logo users of Linux, FreeBSD and other Un*x-like operating systems U and L, short for Unix and Linux
User Experience User Experience logo user experience researchers and experts a combination of the two letters “UX” with a star in the middle created using negative space. The star signifies excellence, which is what the field of UX strives to achieve in product design.
Veganism & Vegetarianism Veganism & Vegetarianism logo those committed to a vegan or vegetarian lifestyle and anyone interested in learning more The "suitable for vegans" symbol
Web Applications Web Applications logo power users of web applications
Webmasters Webmasters logo pro webmasters
WordPress Development WordPress Development logo WordPress developers and administrators The WordPress logo
Worldbuilding Worldbuilding logo writers/artists using science, geography and culture to construct imaginary worlds and settings An unfinished world represented by a primitive sphere; the coloring is taken from a scan of a brain during the act of imagining; the planetary ring was added to make it more distinguishable at smaller sizes