The tag exists on this site - it is a synonym of .

However, when I display the list of tags and I type the name of this tag in the search box, it is not shown. (See the screenshot below.) The two other synonyms of do not behave in this way. (EDIT: As noticed by Martijn Pieters, (where-to-post) and (allowed-topics), which are the other two synonyms, also disappear as soon as the first character after the dash is typed in.)

When I browse the list of tags page by page, the tag is shown. (At the moment it is on page 26, when ordered by name.)

Maybe it has something with the form of this tag and with the fact that it is a synonym.

When I tried to search for the tag (on-topic) on meta.unix.SE it worked fine. (That tag is not a synonym of another tag on that meta.)

On the other hand, when I tried this with the tag (on-topic) on meta.math.SE, the tag was not shown. But the tag named on-topic exists that meta and it is synonym of (allowed-questions).

Another interesting thing is that when I start typing a new question on meta.math.SE and I start typing "on-topic" into the tag field, no tags suggestions are shown until I write the whole phrase on-topic. (Usually most popular tags containing the part I have already typed are shown.)

enter image description here

The following screenshot is from meta.math.SE:

enter image description here

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    As soon as you include a dash plus one more character the other two synonyms also disappear. Mar 10 '14 at 13:19
  • Actually, I cannot reproduce your behaviour here on Meta; on-topi shows me the scope tag. Mar 10 '14 at 13:25
  • @MartijnPieters That's correct. The tag (on-topic-definition) worked ok, when asking a question here. In fact, I found the problem on meta.math.SE. As mentioned in the post, the tag name (on-topic) exists there. The screenshot is from that meta.
    – Martin
    Mar 10 '14 at 13:30
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    @Laura, that meta.MY question is about autocompletion in questions. This MSO question is about autocompletion in question and also in the tag-search page; and is thus a combination of the meta.MY question linked to above and something akin to this other one; and the latter is the same as meta.stackexchange.com/q/174044.
    – msh210
    Mar 16 '14 at 15:56

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