Rare historical term for rugby, using the kanji 蹴球 (football) with ラ (R) to denote rugby. Modern Japanese uses ラグビー.
See also: ラグビー
In pre-war newspapers, the notation 'ラ式蹴球' can sometimes be seen.
Compound of ラ (R, from 'rugby') + 式 (style) + 蹴球 (football). A historical calque or coinage for rugby, now replaced by the loanword ラグビー.