- In mathematics, a real number is a number that can be used to measure a continuous one-dimensional quantity such as a distance, duration or temperature. Here, continuous means that pairs of values can have arbitrarily small differences. Every real number can be almost uniquely represented by an infinite decimal expansion.
- Defender (Atari 2600) online game (atarionline.org)
ATARI DEFENDER is very similar to the Williams coin-operated DEFENDER game. However, you will find some differences in the game play as well as in the graphic images and game controls. For example, in the coin-operated DEFENDER game, two or more Alien Landers can kidnap Humanoids simultaneously, whereas in the ATARI version, Landers can abduct only one Humanoid at a time. In the coin-operated game, you can accidentally kill a Humanoid with your own missile fire while attempting a rescue, and even lose a life in Hyperspace. Such tragedies cannot happen in ATARI DEFENDER. ATARI Humanoids are invulnerable to missile fire, and Universal Space Ship Defender will always emerge from Hyperspace intact.