For the same reason Kilogramme is abbreviated to Kg... to save space when writing or typing the measurement.
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I was taught in grammar class that singular is abbreviated to "sing." while plural is abbreviated to "plur."
Thousand is abbreviated as K.
Circa is abbreviated as ca.
The word 'numbers' can be abbreviated to 'nos' eg. no.7
It is an abbreviated version for 'abdominal muscle'. But it is not really a proper word.