just an word clarification in gate representaion

[Bhuvanesh Nick]

the "7400" Quad 2-input AND. what this pointing here

 

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That's a part number from the old 7400 series TTL parts made by TI and other second sources.
https://en.wikipedia.org/wiki/List_of_7400_series_integrated_circuits

and a history lesson on the parts.
https://en.wikipedia.org/wiki/7400_series

 

[Bhuvanesh Nick]

That's a part number from the old 7400 series TTL parts made by TI and other second sources.
https://en.wikipedia.org/wiki/List_of_7400_series_integrated_circuits

and a history lesson on the parts.
https://en.wikipedia.org/wiki/7400_series

does n indicates the texas instrument or quad
7400N quad..

 

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Its part of a manufacturers part number. Maybe a package designation.