Term used in the gym to indicate a 45-pound weight, used on an olympic barbell. Additionally, the term plate can be used to indicate another weight, when preceded by the number.
Ex1: Im benching 315 now! That's three plates on each side! ( 6x45 + 45 lb. bar )
Ex2: I bought a couple of 25 lb. plates for my home gym.
Prices shown in USD.