About Chinese Pinyin letters
Pinyin writes the four Mandarin tones with the macron, acute, caron and grave on the vowel, plus ü for the front rounded vowel.
macOS has an ABC Extended layout that types tone marks with Option+A (macron), Option+E (acute), Option+V (caron) and Option+` (grave). On Windows the Chinese (Simplified) IME can output pinyin with tones.
ǚ, ǜ, ǘ and ǖ combine the umlaut with a tone mark and are single Unicode characters.
Chinese Pinyin letters: names and codes
Every special letter in Chinese Pinyin, with the Windows Alt code where one exists, the hex code to type in Word followed by Alt+X, the Mac shortcut and the HTML entity. Click a letter to copy it.