Comma (rhetoric)
In Ancient Greek rhetoric, a comma is a short clause, something less than a colon. The plural of comma in English is commata.
In the system of Aristophanes of Byzantium, commata were separated by middle interpuncts.
In antiquity, a comma was defined as a combination of words that has no more than eight syllables.
There is a short text which arguably could have been inserted in the first epistle of John called the Johannine Comma.