Rainbow
A rainbow may refer to any of the following:
1. In general, a rainbow is an arch of colors that forms in the sky because of water droplets. The rainbow colors are red, orange, yellow, green, blue, indigo, and violet.
2. The Rainbow 100 was a microcomputer system originally released in 1982. It was developed by DEC (Digital Equipment Corporation) and used display circuitry from a VT102 computer (also developed by DEC) and a dual processor architecture. It featured both 4 MHz Zilog Z80 and 4.81 MHz Intel 8088 CPUs. The Rainbow 100 could be used in three modes: VT102 mode, 8-bit CP/M mode (with Z80 processor), or 16-bit CP/M-86 or MS-DOS mode (with 8088 processor). It was available in three models: 110A, 100B, and 100+.
3. The Rainbow series is a 6-foot tall stack of books containing computer security standards, originally published by the U.S. Department of Defense in the early 1980s. It was later published again by the National Computer Security Center in the early 1990s.