Latin Capital Letter H
Occupying ASCII code point 72 (0x48), uppercase 'H' is the eighth letter of the Latin alphabet and sits exactly 32 below its lowercase counterpart 'h' at 104 (0x68) — maintaining the single-bit case offset (bit 5) shared by all ASCII A–Z / a–z pairs. A quiet workhorse of English orthography, 'H' most often surfaces in capitalized form at the start of high-frequency words like 'He', 'His', 'Her', and 'How', and as the second character in prolific sentence-opening digraphs such as Th, Sh, Ch, and Ph. In typical English corpora, it ranks among the more common uppercase consonants.
Technical Details
Code Example
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// Header guard convention#ifndef MY_HEADER_H#define MY_HEADER_H// declarations...#endif
Common Usage
HTTP and protocol visibility: 'H' leads some of the web's most foundational acronyms — HTTP, HTTPS, HTML, HSTS, and HDMI — making it one of the most frequently encountered uppercase consonants in technical writing, URLs, browser chrome, and security documentation.
Phonetic complexity: Despite being a single letter, 'H' represents remarkably varied phonetic behavior across languages. In English it signals a voiceless glottal fricative /h/, but it is famously silent in many French words and in English borrowings like 'honour' and 'heir'. Its role as a digraph modifier (th, sh, ch, ph, wh) means it often modifies the sound of its partner rather than contributing its own.
Printf length modifier: In C-family printf-style formatting, lowercase 'h' serves as a length modifier — %hd and %hu format short int and unsigned short respectively, while %hhd targets signed char. The uppercase letter itself does not function as a format specifier, but awareness of this case distinction matters when reading format strings.
Diacritical variants: Uppercase 'H' has a small but specialized set of modified forms — Ħ (stroke) is a distinct letter in Maltese representing a voiceless pharyngeal fricative, Ḥ (dot below) appears in IAST and other transliteration systems for Arabic, Hebrew, and Sanskrit, and Ḫ (breve below) is used in transliterations of Hittite and Egyptian. Ĥ (circumflex) appears in Esperanto as a separate letter.
HTTP and protocol visibility: 'H' leads some of the web's most foundational acronyms — HTTP, HTTPS, HTML, HSTS, and HDMI — making it one of the most frequently encountered uppercase consonants in technical writing, URLs, browser chrome, and security documentation.
Phonetic complexity: Despite being a single letter, 'H' represents remarkably varied phonetic behavior across languages. In English it signals a voiceless glottal fricative /h/, but it is famously silent in many French words and in English borrowings like 'honour' and 'heir'. Its role as a digraph modifier (th, sh, ch, ph, wh) means it often modifies the sound of its partner rather than contributing its own.
Printf length modifier: In C-family printf-style formatting, lowercase 'h' serves as a length modifier — %hd and %hu format short int and unsigned short respectively, while %hhd targets signed char. The uppercase letter itself does not function as a format specifier, but awareness of this case distinction matters when reading format strings.
Diacritical variants: Uppercase 'H' has a small but specialized set of modified forms — Ħ (stroke) is a distinct letter in Maltese representing a voiceless pharyngeal fricative, Ḥ (dot below) appears in IAST and other transliteration systems for Arabic, Hebrew, and Sanskrit, and Ḫ (breve below) is used in transliterations of Hittite and Egyptian. Ĥ (circumflex) appears in Esperanto as a separate letter.