Hi..
Boolean expression for NAND gate is represented by a dot or fullstop symbol (".") and a bar or overline (-).
If A and B are inputs then NAND gate expression is
([A.B]^ - ).
NAND is negation of AND gate so it's truth table is simple. Symbol ,Truth Table are provided in the link.
For further reference you can refer this link
http://images.app.goo.gl/4v1dSacSeG2N3A7c7

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