357

357 is a natural number that follows 356 and precedes 358. In base-10 notation it is 357. It is a composite number with prime factorization 3 × 7 × 17. Its digit sum is 15, making it divisible by 3 but not by 9. The Roman numeral representation of 357 is CCCLVII.

357 Magnum is a revolver cartridge introduced in 1934 by Smith & Wesson and Winchester. It is a rimmed, straight-walled cartridge with a bullet diameter of about 0.357 inches. It was developed to provide greater power than the .38 Special and is commonly used in handguns. Velocities vary with load, typically ranging from around 1,200 to 1,500 feet per second.

357 SIG is a bottleneck pistol cartridge introduced in 1994 by SIG Sauer. It was designed to emulate the performance of the .357 Magnum in semi-automatic pistols and uses roughly 0.355-inch diameter bullets. The case is derived from the 9×19mm Parabellum case, and it is used by law enforcement in various jurisdictions. Typical muzzle velocities with modern loads run roughly from 1,300 to 1,500 feet per second.

International dialing code +357 is assigned to Cyprus. It is used when dialing Cyprus from abroad and covers both landlines and mobile phones.