3 ms·

Besides (YEAR) there also seems to be the convention of [pdf] and less strongly [video]. The latter two use square brackets instead of parentheses.

• lapcat 3y ago
  That's actually in the guidelines already: "If you submit a video or pdf, please warn us by appending [video] or [pdf] to the title."
  • weinzierl 3y ago
    Oh, indeed, it's been a while since I read it. Then I would like to add the guideline "Read the posting, before you comment."