V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

TCL
       Tool Command Language


The Free On-line Dictionary of Computing (30 December 2018):

Tool Command Language
Tcl

    /tik*l/ (Tcl) An interpreted string processing
   language for issuing commands to interactive programs,
   developed by John Ousterhout at UCB.  Each application
   program can extend tcl with its own set of commands.

   Tcl is like a text-oriented Lisp, but lets you write
   algebraic expressions for simplicity and to avoid scaring
   people away.  Though originally designed to be a "scripting
   language" rather than for serious programming, Tcl has been
   used successfully for programs with hundreds of thousands of
   lines.

   It has a peculiar but simple syntax.  It may be used as an
   embedded interpreter in application programs.  It has
   exceptions and packages (called libraries), name-spaces
   for procedures and variables, and provide/require.  It
   supports dynamic loading of object code.  It is eight-bit
   clean.  It has only three variable types: strings, lists and
   associative arrays but no structures.

   Tcl and its associated GUI toolkit, Tk run on all
   flavors of Unix, Microsoft Windows, Macintosh and VMS.
   Tcl runs on the Amiga and many other platforms.

   See also expect (control interactive programs and pattern
   match on their output), Cygnus Tcl Tools, [incr Tcl] (adds
   classes and inheritence to Tcl), Scriptics (John
   Ousterhout's company that is the home of Tcl development and
   the TclPro tool suite), Tcl Consortium (a non-profit agency
   dedicated to promoting Tcl), tclhttpd (an embeddable
   Tcl-based web server), tclx (adds many commands to Tcl),
   tcl-debug.

   comp.lang.tcl FAQ at MIT
   (ftp://rtfm.mit.edu/pub/usenet-by-group/comp.answers/tcl-faq/).
   or at purl.org (http://purl.org/NET/Tcl-FAQ/).

   Scriptics downloads
   (http://scriptics.com/software/download.html).
   Kanji (ftp://srawgw.sra.co.jp/pub/lang/tcl/jp/).

   Usenet newsgroups: news:comp.lang.tcl.announce,
   news:comp.lang.tcl.

   ["Tcl: An Embeddable Command Language", J. Ousterhout, Proc
   1990 Winter USENIX Conf].

   (1998-11-27)