Do you mean this symbol ∈ (or backwards 3) if so, it means is an element of;
Also, ∉ (with strikethrough) (or backwards 3 with strikethrough)
is the symbol for "is not an element of" used in set membership.
See also
Element (mathematics) and
Set (mathematics)
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Terms, in mathematics, are the quantities in a series, expression, or ratio. Mean, or Arithmetic Mean, means the average of a set of numbers. For example if you have the sample 3, 5, 1, 7, 9, 6, then the mean would be (3+5+1+7+9+6)/6 which is 31/6 = 5 1/6.
A matrix in mathematics is a rectangular array of quantities or expressions set out by rows and columns.
Finding the derivative. The derivative is the measure of how a function changes as its input changes.
Natural Log; It's a logarithm with a base of e, a natural constant.
Ton. Cause forwards it is heavy (ton is heavy) and backwards it's "not" not backwards is "ton" :dddddddddddddddddddd