Three-thirty, part of the half-hour clock set — like its siblings it's mostly decorative filler for 'time passing' rather than a literal timestamp. Interestingly, because these 24 emoji were digitized directly from analog clock-face pictograms, some vendors' renderings still show visibly hand-drawn clock hands rather than crisp vector lines.
Keywords: 3, 3:30, 30, clock, thirty, three, three-thirty, time