Which digital logic gate is commonly referred to as the 'coincidence gate' or 'equivalence gate'?

The XNOR (Exclusive-NOR) gate is known as the coincidence gate (or equivalence gate) because its output is high (logic 1) if and only if both of its inputs coincide—meaning both inputs are identical ($A=0, B=0 \implies Y=1$ and $A=1, B=1 \implies Y=1$). If the inputs differ ($A \neq B$), the output is 0. Its truth function is $Y = A \odot B = AB + \overline{A}\,\overline{B}$.

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