Right-to-left

In a right-to-left, top-to-bottom script (commonly shortened to right to left or abbreviated RTL), writing starts from the right of the page and continues to the left.

Arabic script is the most widespread RTL writing system in modern times. As usage of the script spread, the repertoire of 28 characters used to write Arabic language was supplemented to accommodate the sounds of many other languages such as Persian, Pashto, etc.

Several languages have both Arabic RTL and non-Arabic LTR writing systems. For example Sindhi is commonly written in Arabic and Devanagari scripts, and a number of others have been used. Kurdish may be written in Arabic, Latin, Cyrillic or Armenian script.

Hebrew, Syriac, and Mandaean (Mandaic) scripts are, like Arabic, derived from Aramaic and are written RTL. Samaritan is similar, but developed from Proto-Hebrew rather than Aramaic. Many other ancient and historic scripts derived from Aramic and inherited its right-to-left direction.

Taana appeared around 1600 CE. Most modern artificial scripts are LTR, but the African scripts N'Ko (1949), Mende Kikakui (19th century), and Adlam (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's not always possible to classify some ancient writing systems as purely RTL or LTR.

Right-to-left can also refer to top-to-bottom, right-to-left (TB-RL or TBRL) scripts such as Chinese, Japanese, and Korean, though they are also commonly written left to right. Books designed for predominately TBRL vertical text open in the same direction as those for RLTB horizontal text: the spine is on the right and pages are numbered from right-to-left.

List of RTL scripts

Examples of right-to-left scripts (with ISO 15924 codes in brackets) are:

Current scripts

• Arabic script (Arab 160, Aran 161) – used for Arabic, Persian, Urdu and many other languages.
• Hebrew alphabet (Hebr 125) – used for Hebrew, Yiddish and some other Jewish languages.
• Syriac alphabet (Syrc 135, variants 136–138 Syrn Syrj Syre) – used for varieties of the Syriac language.
• Samaritan alphabet (Samr 123) – closely related to Hebrew, used for the Samaritans' writings.
• Mandaic alphabet (Mand 140) – closely related to Syriac, used for the Mandaic language.
• Thaana (Thaa 170) – used for Dhivehi.
• Mende Kikakui (Mend 438) – for Mende in Sierrra Leone. Devised by Mohammed Turay and Kisimi Kamara in the late 19th century. Still used but only by about 500 people.
• N'Ko script (Nkoo 165) – devised for the Manding languages of West Africa.
• Adlam (Adlm 166) – devised in the 1980s for writing the Fula languages of West and Central Africa.

Ancient scripts

• Cypriot syllabary (Cprt 403) – predates Phoenician influence.
• Phoenician alphabet (Phnx 115) – ancient, precursor to Hebrew, Imperial Aramaic, and Greek.
• Imperial Aramaic alphabet (Armi 124) – ancient, closely related to Hebrew and Phoenician. Spread widely by the Neo-Assyrian and Achaemenid empires. The later Palmyrene form (Palm 126) was also used to write Aramaic.
• Old South Arabian
• Pahlavi scripts (130–133: Prti Phli Phlp Phlv) – derived from Aramaic.
• Avestan alphabet (Avst 134) – from Pahlavi, with added letters. Used for recording the Zoroastrian sacred texts during the Sassanid era.
• Sogdian (no code), and Manichaean (Mani 139, associated with the Manichaean religion) – derived from Syriac. Sogdian eventually rotated from RTL to top-to-bottom, giving rise to the Old Uyghur, Mongolian, and Manchu vertical scripts.
• Nabatean alphabet – intermediate between Syriac and Arabic.
• Kharosthi (Khar 305) – an ancient script of India, derived from Aramaic.
• Old Turkic (also called Orkhon runes Orkh 175), and Old Hungarian runes (Hung 176).
• Old Italic alphabets (Ital 210) – Early Etruscan was RTL but LTR examples later became more common. Umbrian, Oscan, and Faliscan were written right-to-left. Unicode treats Old Italic as left-to-right, to match modern usage.
• Lydian alphabet (Lydi 116) – ancient; some texts are left-to-right or boustrophedon.

Computing support

Right-to-left, top-to-bottom text is supported in common consumer software. Often this support must be explicitly enabled. Right-to-left text can be mixed with left-to-right text in bi-directional text.

RTL Wikipedia languages

RTL Wikipedias according to phabricator.wikimedia.org are listed below:

• 'ar' – 'العربية', Arabic
• 'arc' – 'ܐܪܡܝܐ', Aramaic
• 'bcc' – 'بلوچی مکرانی', Southern Balochi
• 'bqi' – 'بختياري', Bakthiari
• 'ckb' – 'Soranî / کوردی', Sorani Kurdish
• 'dv' – 'ދިވެހިބަސް', Dhivehi
• 'fa' – 'فارسی', Persian
• 'glk' – 'گیلکی', Gilaki
• 'he' – 'עברית', Hebrew
• 'lrc' - 'لوری', Northern Luri
• 'mzn' – 'مازِرونی', Mazanderani
• 'pnb' – 'پنجابی', Western Punjabi
• 'ps' – 'پښتو', Pashto
• 'sd' – 'سنڌي', Sindhi
• 'ug' – 'Uyghurche / ئۇيغۇرچە', Uyghur
• 'ur' – 'اردو', Urdu
• 'yi' – 'ייִדיש', Yiddish

See also

• Bi-directional text
• Script (Unicode)
• Writing system

External links

• Everson, Michael (2001-01-08) Roadmapping early Semitic scripts http://www.unicode.org/L2/L2001/01024-n2311.pdf
• Buntz, Carl-Martin (2000-21-12) L2/01-007, Iranianist Meeting Report: Encoding Iranian Scripts in Unicode http://www.unicode.org/L2/L2001/01007-iran.txt