A rugby ball is an elongated ellipsoidal ball used in both codes of rugby football. Its measurements and weight are specified by World Rugby and the Rugby League International Federation, the governing bodies for both codes, rugby union and rugby league respectively.
The rugby ball has an oval shape, four panels and a weight of about 400 grams. It is often confused with some balls of similar dimensions used in American, Canadian and Australian football.
A spheroid, also known as an ellipsoid of revolution or rotational ellipsoid, is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters. A spheroid has circular symmetry.
If the ellipse is rotated about its major axis, the result is a prolate spheroid, elongated like a rugby ball. The American football is similar but has a pointier end than a spheroid could. If the ellipse is rotated about its minor axis, the result is an oblate spheroid, flattened like a lentil or a plain M&M. If the generating ellipse is a circle, the result is a sphere.
Rugby union football, commonly known simply as rugby union or often just rugby, is a close-contact team sport that originated at Rugby School in England in the first half of the 19th century. Rugby involves running with the ball in hand. In its most common form, the game is played between two teams of 15 players each, using an oval-shaped ball on a rectangular field called a pitch. The field has H-shaped goalposts at both ends.
Rugby union is a popular sport around the world, played by people regardless of gender, age or size. In 2023, there were more than 10 million players worldwide, of whom 8.4 million were registered. World Rugby, previously called the International Rugby Football Board (IRFB) and the International Rugby Board (IRB), has been the governing body for rugby union since 1886, and currently has 116 countries as full members and 18 associate members.