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‘in the binary scale only two characters are wanted, namely 1 and 0; in the senary, six; in the decimal, ten’

‘Because six is the product of the first two prime numbers and is adjacent to the next two prime numbers, many senary fractions have simple representations.’

‘Base 2 is called binary, Base 3 is called ternary, Base 4 is called quaternary, Base 5 is called quinary, Base 6 is called senary, Base 7 is called septenary, Base 8 is called octonary or octal.’

Origin

Late 16th century: from Latin senarius ‘containing six’, based on sex ‘six’.