Question

In the following pictures what's this sign used after q and before Z. Please also state the use of this sign. ​

Answer 1

Introduction:-

$\in$:- membership sign (is an element of) founded in 1894 used by Giuseppe Peano

Types:-

It has four types》

1) $\in$ 》 Element of

2) $\notin$ 》 Not an element of

3) $\ni$ 》 Contains as member

4) $\notni$ 》 Does not contains as member

Use:-

The element-of symbol is used in mathematical set theory to indicate that a point, object, or number belongs to a certain set. The symbol resembles the lowercase Greek letter epsilon, but stretched out ( ).

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