breve
n.
mid-15c., musical notation indicating two whole notes, from Latin breve (adj.) "short" in space or time (see brief, adj.). The grammatical curved line placed over a vowel to indicate "shortness" (1540s) is from the same source.
〔李〕[brev;-e] n.短音符号 ←brev (L brevis)=short, shallow 短,浅
〔蒋〕短音符号