More seriously, 1) some mathematical fields, e.g. Galois groups. 2) some specific game strategies: - Bridge has the Stayman Convention (and others) - Chess has Alekhine's Defense (and others)
More seriously, 1) some mathematical fields, e.g. Galois groups. 2) some specific game strategies: - Bridge has the Stayman Convention (and others) - Chess has Alekhine's Defense (and others)