 Thaana appeared around 1600 CE.Most modern scripts are LTR, but N'Ko (1949), Mende Kikakui (19th century), Adlam (1980s) and Hanifi Rohingya (1980s) were created in modern times and are RTL.Ancient examples of text using alphabets such as Phoenician, Greek, or Old Italic may exist variously in left-to-right, right-to-left, or boustrophedon order; so it is not always possible to classify some ancient writing systems as purely RTL or LTR.