I think that’d be gibidollars (Gi$ or something like that?).

All these unusual units are kinda fun, could spice up a presentation or conversation to throw in without context.

It gives me that hacker having fun, tarsnap picodollar/byte-month pricing vibe.

It is the SI prefix for giga, and commonly used instead of B for "Billions" outside of the US when writing "Harvard's endowment fund is currently worth fifty-three billion US dollars".

53G$ == $53B USD