Acronym for TCL Command Language.
It is a scripting language embedded in many applications, much like Elisp is used in Emacs and VisualBasic in many MicrosoftWindows applications. (This does not mean these languages have anything in common; actually they're about as far apart from each other as imaginably possible.)
It is often used in association with the Tk ToolKit; see also tclsh(1), tclsh8.3(1), wish(1), wish8.3(1)
CategoryProgrammingLanguages, CategoryImperativeProgrammingLanguages
7 pages link to TCL: