It is used in set theory and its meaning depends on the way that it is facing.
If the open end is to the right then it indicates that the first set is a subset of the second.
If the open end is to the left then it indicates that the first set is a superset of the second (the second is a subset of the first).
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"a subset of
That's a u
it mean a heart turn ur head sideways and u will see it look <3 3 can also stand for the letter E as in "l33t" which means "leet"
a math book is were u learn math
Yes u have to subtract the two numbers that it says.so yes leftover does mean subtract!