You know what it looks like… but what is it called?
TAKE THE QUIZ“sinistra”
The following 2 entries include the term sinistra.
colla sinistra
adverb (or adjective): with the left hand —used as a direction in keyboard music
mano sinistra
noun: the left hand —used as a direction in music —abbreviation MS, SM
Love words? Need even more definitions?
Merriam-Webster unabridged