The letter h may represent /h/ as in the name of the Székely town Hargita; intervocalically it represents /ɦ/ as in tehén; it represents /x/ in the word doh; it represents /ç/ in ihlet; and it is silent in cseh. As part of a digraph, it represents, in archaic spelling, /t͡ʃ/ with the letter c as in the name Széchenyi; it represents, again, with the letter c, /x/ in pech (which is pronounced [pɛxː]); in certain environments it breaks palatalization of a consonant, as in the name Beöthy which is pronounced [bøːti] (without the intervening h, the name Beöty could be pronounced [bøːc]); and finally, it acts as a silent component of a digraph, as in the name Vargha, pronounced [vɒrgɒ]. In Ukrainian and Belarusian, when written in the Latin alphabet, ⟨h⟩ is also commonly used for /ɦ/, which is otherwise written with the Cyrillic letter ⟨г⟩. In Irish, ⟨h⟩ is not considered an independent letter, except for a very few non-native words, however ⟨h⟩ placed after a consonant is known as a "séimhiú" and indicates lenition of that consonant; ⟨h⟩ began to replace the original form of a séimhiú, a dot placed above the consonant, after the introduction of typewriters. In most dialects of Polish, both ⟨h⟩ and the digraph ⟨ch⟩ always represent /x/. In Basque, during the 20th century it was not used in the orthography of the Basque dialects in Spain but it marked an aspiration in the North-Eastern dialects.
ᴴ : Modifier letter H is used in the Uralic Phonetic Alphabet
ₕ : Subscript small h was used in the Uralic Phonetic Alphabet prior to its formal standardization in 1902
ʰ : Modifier letter small h is used in Indo-European studies
ʮ and ʯ : Turned H with fishhook and turned H with fishhook and tail are used in Sino-Tibetanist linguistics
Ƕ ƕ : Latin letter hwair, derived from a ligature of the digraph hv, and used to transliterate the Gothic letter 𐍈 (which represented the sound [hʷ])
Ⱶ ⱶ : Claudian letters
Ꟶ ꟶ : Reversed half h used in Roman inscriptions from the Roman provinces of Gaul

Ancestors, siblings, and descendants in other alphabets
𐤇 : Semitic letter Heth, from which the following symbols derive
Η η : Greek letter Eta, from which the following symbols derive
𐌇 : Old Italic H, the ancestor of modern Latin H
ᚺ, ᚻ : Runic letter haglaz, which is probably a descendant of Old Italic H
Һ һ : Cyrillic letter Shha, which derives from Latin H
И и : Cyrillic letter И, which derives from the Greek letter Eta
𐌷 : Gothic letter haalArmenian letter ho (Հ)

Derived signs, symbols, and abbreviations
h : Planck constant
ℏ : reduced Planck constant

  
    
      
        
          H
        
      
    
    {\displaystyle \mathbb {H} }
   : Blackboard bold capital H used in quaternion notation

Computing codes
1 and all encodings based on ASCII, including the DOS, Windows, ISO-8859, and Macintosh families of encodings.