What does "q=" stand for?

Carrie2962

I have seen "q=" in some records, such as this:

https://antenati.cultura.gov.it/ark:/12657/an_ua202467/Lz4XMmP

This is an example: Maria Gardella di Andrea q= Carlo

Is this the same as "fu"?

Cousin Vinny

Quondam. Same as fu, although it's Latin.

Carrie2962

Thank you, @Cousin Vinny!