"Right to Left" - this refers to the direction of writing. The Arabic script and N'Ko are written RTL. Tifinagh can be written RTL although it is apparently mote often LTR (left to right).
This text flow presents significant text and graphic layout implications. (MultiLingual)
MultiLingual. 2007. "Glossary." 2007 Resource Directory. http://www.multilingual.com/resourceDirectory/