The Teachers' Lounge is a chat room only accessible to the Stack Exchange Network's moderators.
NOTE: if you're a ♦ moderator, there's more information in the Help Center; add
/help/mod-tlto the URL of your site's homepage, e.g. https://meta.stackexchange.com/help/mod-tl
The primary purpose of the Teacher's Lounge is for moderators to obtain peer review, and staff advice, related to moderation, when that may not be available from within their own per-site moderator chat rooms.