Figured Bass
bass continuo, also called figured bass
figured bass
Figured Bass
I believe the term you are looking for is "figured bass".
Keyboard continuo can be extemporized ad lib from a figured bass, but the music is complete with three basses.
it is a shorthand
Figured bass was basically a chord chart (also indicating the inversion ) in the Baroque period and musicians improvised upon those charts much like jazz players do today using modern chord chart notation. It was during the later classical period that composers started writing music down in an exact manner and expected musicians to play exactly note by note. Also, figured bass is similar to the Nashville number system. I is the tonic and V is the dominant.....et cetera.
Q&A is already shorthand for "question and answer."
the shorthand for a angry face :@
The triangle in shorthand means "therefore"
the shorthand for a crying face :'( Also, ='[ and ='( and :'[