What's the difference between i.e. and e.g.?
1640s, "small number of military men detailed for some purpose," from French esquade, from Middle French escadre, from Spanish escuadra or Italian squadra "battalion," literally "square," from Vulgar Latin *exquadra (see square). Until the introduction of automatic weapons, infantry troops tended to fight in a square formation to repel cavalry or superior forces. Sports sense is recorded from 1902.