Latin anno post Christum natum (the year after the birth of Christ)
also APR, abbreviation of annual percentage rate, attested from 1979, American English.
a.p.r.c. Latin anno post Roman conditam (year after the foundation of Rome)
a.r.v.r. Latin anno Regni Victoriae Reginae (in the year of the reign of Queen Victoria)
actual weight. (in shipping) all water. atomic weight. actual weight all water