Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission (ARCADE) is a program which utilizes high-altitude balloon instrument package intended to measure the heating of the universe by the first stars and galaxies after the big bang and search for the signal of relic decay or annihilation. In July 2006 a very strong radio source was found using the radiometer.

Arcade may refer to:

• Arcade (architecture), a series of adjoining arches
• Arcade cabinet, housing which holds an arcade game's hardware
• Arcade (design), a motif in art
• Arcade game, a coin operated game machine usually found in a game or video arcade
• Arcade system board, a standardized printed circuit board
• Arterial arcades, small intestinal arteries
• Penny arcade (venue), any type of venue for coin-operated devices
• Video arcade, a place with video games (See also: Amusement arcade)