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
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Merriam-Webster unabridged