/ ˈkɒmə; NAmE ˈkɑːmə/ noun
the mark ( , ) used to separate the items in a list or to show where there is a slight pause in a sentence
—see also inverted commas
late 16th cent. (originally as a term in rhetoric denoting a group of words shorter than a colon): via Latin from Greek komma piece cut off, short clause, from koptein cut.