Digital Electronics
A NAND gate is called a universal logic element because

Many digital computers use NAND gates.
It is used by everybody
Any logic function can be realized by NAND gates alone
All the minization techniques are applicable for optimum NAND gate realization

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Digital Electronics
ASCII

 has 128 characters including control characters
 is used only in western countries
 is a subset of 8-bit EBCDIC
 is version II of the ASC standard

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