Judo (meaning "gentle way") was created as a physical, mental and moral pedagogy in Japan, in 1882, by Jigoro Kano (嘉納治五郎). It is generally categorized as a modern martial art which later evolved into a combat and Olympic sport. Its most prominent feature is its competitive element, where the objective is to either throw or takedown an opponent to the ground, immobilize or otherwise subdue an opponent with a pin, or force an opponent to submit with a joint lock or a choke. Strikes and thrusts by hands and feet as well as weapons defenses are a part of judo, but only in pre-arranged forms (kata, 形) and are not allowed in judo competition or free practice (randori, 乱取り). A judo practitioner is called a judoka.

Judo was first included in the Summer Olympic Games at the 1964 Games in Tokyo, Japan. After not being included in 1968, judo has been an Olympic sport in each Olympiad since then. Only male judoka participated until the 1988 Summer Olympics, when women participated as a demonstration sport. Women judoka were first awarded medals at the 1992 Summer Olympics.

Judoka compete in weight classes. Each country may qualify a maximum of one athlete per weight class.

Numerical denomination and date surrounded by geometric patterns and Southern Cross.

Crux is a constellation located in the southern sky in a bright portion of the Milky Way, and is the smallest but one of the most distinctive of the 88 modern constellations. Its name is Latin for cross, and it is dominated by a cross-shaped or kite-like asterism that is commonly known as the Southern Cross.