Source : Free On-Line Dictionary of Computing

LTR3
     
        Version three of {LTR}, by A. Parayre of Delegation Generale
        pour l'Armement, France.  LTR3 was widely used by the French
        military and avionics companies.
     
        ["The LTR3 Reference Manual", A. Parayre, Delegation Generale
        pour l'Armement, France].
     
        (1995-01-31)