NAND gate
If any input on the NAND gate is '0', the output will be '1'.
Truth table for a 2-input NAND gate:
Input 1
Input 2
Output
0
0
1
0
1
1
1
0
1
1
1
0
See also:
Logic family parts
Simulation of Digital ICs
Schmitt NAND gate
Using electronics parts