noun
block sign; signal
In baseball, a hand signal or sign used between players or coaches, often to communicate strategy. Wasei-eigo from English 'block sign'.
wasei-eigo (Japanese-coined English), from block sign
キャッチャーがピッチャーにブロックサインを送る。
The catcher sends a block sign to the pitcher.
Variant with a middle dot; less common in everyday writing.
Wasei-eigo from English 'block sign'. The exact origin is uncertain, but it likely refers to a set of signs used to block or counter the opposing team's strategy.