1. wild card From card games in which certain cards, often the joker, can act as any other card A special character or character sequence which matches any character in a string comparison, like ellipsis "..." in ordinary written text. In Unix filenames '?' matches any single character and '*' matches any zero or more characters. In regular expressions, '.' matches any one character and "[...]" matches any one of the enclosed characters. See also Backus-Naur Form. 2. a playing card whose value can be determined by the person who holds it
