TCL may mean: Transportation Transports en commun lyonnais, the Lyon public transport system. Tuscaloosa Regional Airport (IATA: TCL) Computer languages Tcl (Tool Command Language), a computer programming language Terminal Control Language, used to program VeriFone devices Terminal Control Language, a Pick operating system command language Trader Constraint Language, part of the CORBA Notification Service Transaction Control Language, a family of computer languages used by database syst… (More on Tcl)