Anno Domini
Some people mistakenly interpret “A.D.” as standing for “after death.”  The abbreviation “A.D.” was originally placed before the year number (e.g. A.D. 145); then “B.C.” often placed after the year number (e.g. 145 B.C.).  Nowadays it is more usual to put both abbreviations after the numbers (e.g. 145 AD; e.g. 145 BC).