- Atlantis is a fixed shooter video game released by Imagic in July 1982 for the Atari 2600. It was written by Dennis Koble who also wrote Trick Shot for Imagic. Atlantis was ported to the Atari 8-bit computers, VIC-20, Intellivision, and Magnavox Odyssey 2.
- Right angle (Wikipedia)
In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or đ/2 radians corresponding to a quarter turn. If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles. The term is a calque of Latin angulus rectus; here rectus means “upright”, referring to the vertical perpendicular to a horizontal base line.