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8 Bit Byte

Factors behind the ubiquity of the eight bit byte include the popularity of the IBM System/360 architecture, introduced in the 1960s, and the 8-bit microprocessors, introduced in the 1970s. The term octet unambiguously specifies an eight-bit byte (such as in protocol definitions, for example)

Otherwise, people have tried with 12 bit byte. Varying byte length in PDP 10. 6, 7 and 9 bits in Univac computers.