The pronunciation  and the associated spelling "haitch" is often considered to be h-adding and is considered non-standard in England. It is, however, a feature of Hiberno-English, and occurs sporadically in various other dialects. The perceived name of the letter affects the choice of indefinite article before initialisms beginning with H: for example "an H-bomb" or "a H-bomb". The pronunciation /heɪtʃ/ may be a hypercorrection formed by analogy with the names of the other letters of the alphabet, most of which include the sound they represent.The haitch pronunciation of h has spread in England, being used by approximately 24% of English people born since 1982, and polls continue to show this pronunciation becoming more common among younger native speakers. Despite this increasing number, the pronunciation without the /h/ sound is still considered to be standard in England, although the pronunciation with /h/ is also attested as a legitimate variant. In Northern Ireland, the pronunciation of the letter has been used as a shibboleth, with Catholics typically pronouncing it with the /h/ and Protestants pronouncing the letter without it.Authorities disagree about the history of the letters name. The Oxford English Dictionary says the original name of the letter was [ˈaha] in Latin; this became [ˈaka] in Vulgar Latin, passed into English via Old French [atʃ], and by Middle English was pronounced [aːtʃ]. The American Heritage Dictionary of the English Language derives it from French hache from Latin haca or hic.
During the standardization of Basque in the 1970s, the compromise was reached that h would be accepted if it were the first consonant in a syllable. Hence, herri ("people") and etorri ("to come") were accepted instead of erri (Biscayan) and ethorri (Souletin). Speakers could pronounce the h or not. For the dialects lacking the aspiration, this meant a complication added to the standardized spelling. Other systems
As a phonetic symbol in the International Phonetic Alphabet (IPA), it is used mainly for the so-called aspirations (fricative or trills), and variations of the plain letter are used to represent two sounds: the lowercase form ⟨h⟩ represents the voiceless glottal fricative, and the small capital form ⟨ʜ⟩ represents the voiceless epiglottal fricative (or trill). With a bar, minuscule ⟨ħ⟩ is used for a voiceless pharyngeal fricative. Specific to the IPA, a hooked ⟨ɦ⟩ is used for a voiced glottal fricative, and a superscript ⟨ʰ⟩ is used to represent aspiration. Related characters
Descendants and related characters in the Latin alphabet
H with diacritics: Ĥ ĥ Ȟ ȟ Ħ ħ Ḩ ḩ Ⱨ ⱨ ẖ ẖ Ḥ ḥ Ḣ ḣ Ḧ ḧ Ḫ ḫ ꞕ Ꜧ ꜧ
IPA-specific symbols related to H: ʜ ɦ ʰ ʱ ɥ ᶣ ɧ
Superscript IPA symbols related to H: 𐞖 𐞕
ꟸ: Modifier letter capital H with stroke is used in VoQS to represent faucalized voice.