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[ShadowHM]

Well, you piqued my curiosity. :P I am not a fan of spectator sports, so haven't squandered any time watching boxing matches. The square ring question had not occurred to me.

But now, thanks to Wikipedia, I know that:

The name ring is an atavism from when contests were fought in a roughly drawn circle on the ground. The name ring continued with the Jack Broughton rules in 1743, which specifed a small circle in the centre of the fight area where the boxers met at the start of each round. The first square ring was introduced by the Pugilistic Society in 1838. That ring was specified as 24 feet square and bound by two ropes. For these and other reasons, the boxing ring is commonly humorously referred to as the "square circle."