Cool refers to a moderately low temperature. Alternatively, cool or COOL may refer to: Cool (aesthetic), an aesthetic of attitude, behavior, and style Cool (African aesthetic), an aesthetic standard in artistic expression and physical appearance Cool (programming language) Country of Origin Labeling, an American food labeling requirement Mr. Cool, a fictional character in the Mr. Men children's book series COOL, a computer language used in the CLIPS tool Cool was the internal name of C# Cool colors, a perceptual and psychological classification of colors Majesco Entertainment a company traded under the NASDAQ with ticker symbol COOL.