RhymeZone: rtl definitions

Definitions of RTL:

adjective: Initialism of right-to-left. [(chiefly of text) That is written (and is read) from right to left.]
noun: (electronics) Initialism of register-transfer level.
noun: (programming) Initialism of runtime library.
noun: (aviation) Initialism of rudder travel limiter.

(Definitions from Wiktionary)