Yes, si is in the scrabble dictionary

...and is worth 2 points by itself.

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Si Definition

noun

Music Ti.
from The American Heritage Dictionary of the English Language, 4th Edition

abbreviation

International System of Units.
from Free Scrabble Dictionary

symbol

Silicon.
from Free Scrabble Dictionary

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Top Words by points

Points

is

2

2 letter words with SI

Points

is

2

si

2

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