OR gate

The OR gate is a logic gate that outputs 1 (true) when at least one of its inputs is 1 (true). That means that if both of its inputs are 0, the output will be 0.

INPUT		OUTPUT
A	B	A OR B
0	0	0
0	1	1
1	0	1
1	1	1

The best way to remember an OR operation is "one or the other, or both."

Symbols

There are three symbols for the OR gate:

MIL/ANSI Symbol	IEC Symbol	DIN Symbol