The abbreviation for centimeter is cm. The abbreviation for
meter is m. The abbreviation for inches is in. The abbreviation for
liter is L.
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"GPA" is already an abbreviation for "grade point average".
There is no further abbreviation for the abbreviation.
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Parent is actually an abbreviation itself. It is an abbreviation
for parental. Some say that an abbreviation could be rent, but
other than that since it is an abbreviation it doesn't really have
an abbreviation.