Latin Small Letter Y
Straddling the line between vowel and consonant more than any other letter in the English alphabet, lowercase 'y' functions as a consonant at the beginnings of syllables (yes, you, beyond) and as a vowel in other positions (gym, happy, my, rhythm). It is the twenty-fifth letter of the Latin alphabet and accounts for roughly 2 % of characters in typical English corpora. In ASCII it sits at code point 121 (0x79), positioned 32 above its uppercase counterpart 'Y' at 89 (0x59), maintaining the single-bit case offset (bit 5) shared by all ASCII A–Z / a–z pairs.
Technical Details
Code Example
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// 2D coordinates with x, ystruct Point {int x;int y;};struct Point p = {10, 20};printf("(%d, %d)\n", p.x, p.y); // (10, 20)
Common Usage
Borrowed from Greek: Unlike most Latin letters that evolved from Phoenician through Etruscan, 'y' was borrowed directly into Latin from Greek upsilon (Υ) around the 1st century BCE to render Greek loanwords containing the rounded front vowel /y/ — a sound not native to Latin. The Romans called it 'y Graeca' (Greek y), a name preserved in Spanish 'i griega' and French 'i grec'. English inherited both the letter and its phonetic flexibility.
Date and time formatting: In strftime and similar time-formatting functions across C, Python, Ruby, and most POSIX-compliant systems, %y produces the two-digit year (00–99), while %Y outputs the full four-digit year. This convention dates to early Unix and remains standard in log file naming, timestamp generation, and date serialization across platforms.
Suffix prominence: The letter 'y' is among the most frequent word-ending characters in English, appearing in common suffixes like -ly (quickly, happily), -ty (beauty, safety), -ry (history, mystery), and -fy (simplify, notify). This suffix dominance contributes significantly to its overall frequency despite its relative rarity at word beginnings outside a few high-frequency items like 'you', 'your', and 'year'.
Diacritical variants: Vietnamese employs its full set of tone diacritics on 'y' — ý (acute), ỳ (grave), ỷ (hook above), ỹ (tilde), ỵ (dot below). In European languages, ý (acute) functions as a distinct letter in Icelandic, Czech, and Slovak; ÿ (diaeresis) appears in French proper nouns such as l'Haÿ-les-Roses; and Welsh uses ŷ (circumflex), ẏ (dot above), ý (acute), and ÿ (diaeresis), reflecting the letter's full vowel status in that language.
Borrowed from Greek: Unlike most Latin letters that evolved from Phoenician through Etruscan, 'y' was borrowed directly into Latin from Greek upsilon (Υ) around the 1st century BCE to render Greek loanwords containing the rounded front vowel /y/ — a sound not native to Latin. The Romans called it 'y Graeca' (Greek y), a name preserved in Spanish 'i griega' and French 'i grec'. English inherited both the letter and its phonetic flexibility.
Date and time formatting: In strftime and similar time-formatting functions across C, Python, Ruby, and most POSIX-compliant systems, %y produces the two-digit year (00–99), while %Y outputs the full four-digit year. This convention dates to early Unix and remains standard in log file naming, timestamp generation, and date serialization across platforms.
Suffix prominence: The letter 'y' is among the most frequent word-ending characters in English, appearing in common suffixes like -ly (quickly, happily), -ty (beauty, safety), -ry (history, mystery), and -fy (simplify, notify). This suffix dominance contributes significantly to its overall frequency despite its relative rarity at word beginnings outside a few high-frequency items like 'you', 'your', and 'year'.
Diacritical variants: Vietnamese employs its full set of tone diacritics on 'y' — ý (acute), ỳ (grave), ỷ (hook above), ỹ (tilde), ỵ (dot below). In European languages, ý (acute) functions as a distinct letter in Icelandic, Czech, and Slovak; ÿ (diaeresis) appears in French proper nouns such as l'Haÿ-les-Roses; and Welsh uses ŷ (circumflex), ẏ (dot above), ý (acute), and ÿ (diaeresis), reflecting the letter's full vowel status in that language.