I also looked this one up on another site. It means cubic inch.
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I am not aware of a unit of measurement for volumewhose symbol is ci.
If you mean as in Roman numerals CI - XLVIII then it is LIII
If you mean CI minus XLVIII then it is LIII because 101 minus 48 = 53
I quess it should be what is a smoot not what does it mean. It is a unit of measurement.
tsb is teaspoon