Generally, one side has the imprint or embossing of the official head of state or an insignia or emblem and hence it's called the head side. www.money.org › numismatic-blog › three-sides-of-a-coin. Heads and tails are the modern English vernacular terms used for the each side of a coin. The technical terms used by numismatists are "obverse" for the side with.

And: Coin sides names

1928 P DOUBLE EAGLE GOLD COIN	161
Coin sides names	621
Coin sides names	366
2012 star spangled banner two coin proof set