Sometimes, special bit patterns are. The standard defines five basic formats that are named for their numeric base and the number of bits used in their interchange encoding Typically 0 (zero) and 1 (one). Two's complement is the most common method of representing signed (positive, negative, and zero) integers on computers, [1] and more generally, fixed point binary values In computing, signed number representations are required to encode negative numbers in binary number systems In mathematics, negative numbers in any base are represented by prefixing them with a minus sign (−)
However, in ram or cpu registers, numbers are represented only as sequences of bits, without extra symbols A more efficient encoding would use all 16 values
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