Belted magnums: .257 Weatherby Magnum, 6.5 Remington Magnum, .264 Winchester Magnum, .270 Weatherby Magnum, 7 x 61 Sharpe & Hart, 7mm Remington Magnum , 7mm Weatherby Magnum, 7mm STW, .300 H&H Magnum, .300 Winchester Magnum , .300 Weatherby Magnum , .308 Norma Magnum, 8mm Remington Magnum, .338 Winchester Magnum , .340 Weatherby Magnum, .350 Remington Magnum, .358 Norma Magnum, .375 H&H Magnum, .416 Remington Magnum, .458 Winchester Magnum , .458 Lott Magnum, etc.

Simply put a ring near the base of the casing(brass), is referred to as a belt

Examples of non belted(standard) are 243, 270win, 280 rem, 308 win, 3006 sprg, 3030 win and the list goes on.