It is very likely that this symbol is added for baseball. It's not from the Japanese national standard but from a character set for Japanese TV sets called ARIB

It is very likely that this symbol is added for baseball. It's not from the Japanese national standard but from a character set for Japanese TV sets called ARIB charset (1). According to Wikipedia (2), ↉ is actually used for baseball scores. It says that if a pitcher is removed before any batter is put out, he threw ↉ innings for that inning on the record. 1 https://en.wikipedia.org/wiki/ARIB_STD_B24_character_set https://en.wikipedia.org/wiki/ARIB_STD_B24_character_set 2 https://ja.wikipedia.org/wiki/%E6%8A%95%E7%90%83%E5%9B%9E https://ja.wikipedia.org/wiki/%E6%8A%95%E7%90%83%E5%9B%9E