Ca, symbol for the element calcium calcium (kăl`sēəm) [Lat.,=lime], metallic chemical element; symbol Ca; at. no. 20; at. wt. 40.08; m.p. about 839°C;; b.p.
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cellular automata (CA)

Simplest model of a spatially distributed process that can be used to simulate various real-world processes. Cellular automata were invented in the 1940s by John von Neumann and Stanislaw Ulam at Los Alamos National Laboratory. They consist of a two-dimensional array of cells that “evolve” step-by-step according to the state of neighbouring cells and certain rules that depend on the simulation. Though apparently simple, CAs are universal computers—that is, they can do any computer-capable computation. The best-known cellular automaton, John Conway's “Game of Life” (1970), simulates the processes of life, death, and population dynamics.

CA

(1) (Certification Authority or Certificate Authority) An organization that issues digital certificates (digital IDs) and makes its public key widely available to its intended audience. See digital certificate and cryptography.

(2) (Continuous Availability) See fault tolerant.

(3) See Computer Associates.

1.	(theory, architecture)	CA - cellular automaton.
2.	(company)	CA - Computer Associates.
3.	(cryptography)	CA - Certificate Authority.
4.	(networking)	ca - The country code for Canada.