The question does not say which country.
The U.K. uses the penny, with lettering ...
Elizabeth II · DEI · GRA · REG · FID · DEF · 2015 ·
J.C
ELIZABETH II DEI GRATIA REGINA FIDEI DEFENSOR
Elizabeth 2nd, by the Grace of God, Queen and Defender of the Faith
Engraver: Jody Clark
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Your answer depends on the date on the penny.
if you earn a penny and you save it
The initials a.m. stand for ante meridian, Latin for "before noon." The initials p.m. stand for post meridian, Latin for "after noon."
A penny is a unit if currency (money), thus one penny means one unit/coin of this currency (1p).
Latin: exempli gratia (e.g.) means for example.