The term 'arcade coin' refers to the coins, tokens, and other forms of currency used in arcade games. The crossword solutions for this term are 'PENNY' (5 letters), 'TOKEN' (5 letters), 'oneplay' (7 letters), 'DIE' (3 letters), 'skee' (4 letters), and 'atari' (5 letters). PENNY and TOKEN are both forms of currency used in arcades, while oneplay is a type of TOKEN that can be used in multiple machines. DIE and skee are two popular arcade games, and Atari is a well-known video game company that has produced many classic arcade games.