A kumquat is a useless reference fruit to me

Carrie • M/C 12/2016 • TFMR 12/2017 • M/C 7/2018 Baby girl born 12/27/19 Baby boy due 12/19/21

I've never eaten a kumquat, nor would I even know where to buy one. Maybe this is a regional thing...? Now I want to try one, if only to see how big it is since just about every embryo size comparison chart uses it.