Zero onset

In orthography, a zero consonant, silent initial, or null-onset letter is a consonant letter that does not correspond to a consonant sound, but is required when a word or syllable starts with a vowel (i.e. has a null onset). Some abjads, abugidas, and alphabets have zero consonants, generally because they have an orthographic rule that all syllables must begin with a consonant letter, whereas the language they transcribe allows syllables to start with a vowel. In a few cases, such as Pahawh Hmong below, the lack of a consonant letter represents a specific consonant sound, so the lack of a consonant sound requires a distinct letter to disambiguate.

Uses

*The letter א '' aleph'' is a zero consonant in Ashkenazi Hebrew. It originally represented a glottal stop, a value it retains in other Hebrew dialects and in formal Israeli Hebrew.
*In Arabic, the related letter ا ''alif'' is often a placeholder for a vowel.
*In Javanese script, the letter ꦲ ha is used for a vowel (silent 'h').
*In Korean hangul, the zero consonant is ''ieung''. It appears twice in , "velar consonant". also represents -''ng'' at the end of a syllable, but historically this was a distinct letter.
* Burmese , Khmer អ, Thai อ, and Lao ອ are null-initial vowel-support letters. Thai อ่าง, for example, is ''ang'' "basin". (า is the vowel ''a'' and ง the consonant ''ng.'') อ and ອ pull double duty as vowels in some positions.
*In Thaana of the Maldives, އ is a zero. It requires a diacritic to indicate the associated vowel: އި is ''i,'' އޮ ''o,'' etc. This is similar to an abjad, but the vowel mark is not optional.
*The Lontara script for Buginese, with zero ᨕ, is similar to Thaana, except that without a vowel diacritic ᨕ represents an initial vowel ''a.'' The Lepcha script of Nepal is similar.
*In Cree and Inuit, a triangle represents a vowel-initial syllable. The orientation of this triangle specifies the vowel: ᐁ ''e,'' ᐃ ''i,'' ᐅ ''o,'' ᐊ ''a.''
*In the Romanized Popular Alphabet used for Hmong, an apostrophe marks a vowel-initial syllable. The absence of any letter indicates that the syllable starts with a glottal stop, a far more common occurrence.
*Pahawh Hmong, a semi-syllabary, also has a zero consonant, as well as a letter for glottal stop, with the lack of an initial consonant letter indicating that the syllable begins with a .

See also

*Virama, a zero-vowel diacritic in many abugidas, such as Hindi Devanagari. The virama marks the absence of a vowel; the absence of a virama or vowel diacritic implies an inherent vowel such as schwa.
*Sukun, the optional zero-vowel diacritic of Arabic.
*Zero (linguistics), a broader concept
*Silent letter

References

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Typography