A comma at the end of a comment, clause or even otherwise-perfect sentence that then receives no continuation.
My cousin used the terminal comma when she sent me this text message:
> Wow, grandma didn't invite you to the family get-together,
and then all my cousins and brother went to the movies.
> Wow, grandma didn't invite you to the family get-together,
and then all my cousins and brother went to the movies.
by Sittias June 2, 2021