@saturn @cadey (I can't read Japanese, I'm just familiar with the context and verified it with google translate)

The katakana for League Battle, リーグマッチ, could be literally translated as League Match (rīgumatchi), and is shortened to リグマ (riguma).

The image is from the comic Watchmen, and is a specifically a reference to this edit.

(リグマ・ボールズ : riguma bōruzu)