AU - Grenfell

Apprentice

A new jockey who has not ridden a certain number of winners in a specified time period.

Pari-Mutuel

A pool style wagering system, where all money input through betting is divided among those with winning tickets (save for various deductions by the track operators).

Show Wager

Betting on a horse to finish in the first three spots, which pays out the same whether they win or run second or third.