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Set membership

We say that an element belongs to a set if it is part of the set. We use the symbol $$\in$$.

$$$ 10\in\Z,\;L\in\{A,B,I,\Tred{L}\} $$$

When an element does not belong to a set we use $$\notin$$.

$$$O\notin\{A,B,I,L\},\;-1\notin\N,\;\pi\notin\Q $$$
The set of the primary and secondary colours contains the element 'green'.
The set of the primary and secondary colours contains the element 'green'.