10001010

10001010 is an eight-bit binary numeral. In binary, the bits from most significant to least are 1 0 0 0 1 0 1 0, which corresponds to 138 in decimal when interpreted as an unsigned value. In hexadecimal notation, this byte is 0x8A.

In signed 8-bit representation using two's complement, the same bit pattern represents -118. This follows from inverting the bits and adding one to obtain the magnitude, or by subtracting 256 from the unsigned value (138 - 256 = -118).

In practical computing contexts, 10001010 often appears as a single data byte. As an ASCII or Unicode code point, the value 0x8A is not a standard printable character in basic ASCII; in various extended encodings or code pages, it can map to different symbols or control codes. In many hardware and software configurations, 0x8A may be used as a flag, a mask, or part of a larger data structure or instruction set.

From a mathematical viewpoint, 10001010 is simply one eight-bit binary number and one possible representation of the decimal value 138 (unsigned) or -118 (signed). It can be involved in bitwise operations such as masking, shifting, or combining with other bytes in low-level programming, digital electronics, and data encoding tasks.