Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun electrical engineering A
logic gate which is theinverse ofXOR .
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Examples

By adding another function bit to bitwise negate A as well, we can include all possible (nonidentity) bitwise operations (NOT, AND, OR, NAND, NOR, XOR, XNOR).
BabbageBoole Digital Arithmetical and Logical Mill: Part 1 « The HalfBaked Maker

Applying a set of rules to the combination of bits at a given pixel (in the case of this Demonstration, XNOR) reveals the message, which might look like this:

Applying a set of rules to the combination of bits at a given pixel (in the case of this Demonstration, XNOR) reveals the message, which might look like this:
Wolfram Blog : Secret Codes in The Wolfram Demonstrations Project (But No Dinosaurs)

When using NOR, XNOR takes four NORs and XOR takes five.

Here the exclusive nor (XNOR) returns "true" if input a1 and a2 are identical, and returns "false" if they are different.

If the grouping of (a1 XNOR a2) returns true, the search can stop.

Here the exclusive nor (XNOR) returns "true" if input a1 and a2 are identical, and returns "false" if they are different.
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