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squash racquets

(Encyclopedia) squash racquets or squash, game played on a four-walled court, 16 ft (4.88 m) high by 181&fslsh;2 ft (5.64 m) wide by 32 ft (9.75 m) long. The back wall, shorter than the front…

infinity

(Encyclopedia) infinity, in mathematics, that which is not finite; it is often indicated by the symbol ∞. A sequence of numbers, a1, a2, a3, … , is said to “approach infinity” if the numbers…

spirit level

(Encyclopedia) spirit level, tool for determining whether a surface is horizontal. It consists essentially of a slightly bent transparent tube that is held in a frame. The tube contains some alcohol…

ray, in physics

(Encyclopedia) ray, in physics, term denoting the straight line along which light or other form of radiation is propagated from its source. It generally refers to the line of propagation of waves but…

Karan, Donna

(Encyclopedia) Karan, Donna, 1948–, American fashion designer, b. Forest Hills, N.Y., as Donna Faske. Daughter of a tailor and a garment saleswoman, she started to design clothes as a teenager and…