The complete version of the spelling rules for ü should be:

1. Xiao ü is polite and takes off his hat when meeting j?q?x. ?

2. Small ü meets big y, remove two points and still read ü.

3. ü spells n and l, two points cannot be saved.

According to the "Chinese Pinyin Plan", when yu is spelled with j, q, and x, you can write it as u without using additional symbols, because the real u is definitely different from j, q, and x. The u that appears after an initial consonant can only be yu; and when the final rhyme in the ü line becomes a syllable alone, it becomes yu according to the rules, and the affixed letter ü will not appear.

Extended information

Be careful when using the vowel ü?, add y before the dot when ? is independent; (if the finals starting with ü become a self-syllable, add y and omit the two dots) n ?l does not go to the point when fighting, ?go to the point only refers to j?q?x?. When the finals of the ü column are spelled with the initial consonants j, q, and x, they are written as: ju (ju), qu (district), xu (empty), and the two dots are omitted; but when spelled with the initial consonants n and l, they are still written as nü ( Female), lü (LV).

In addition, in official documents such as passports, N? is written as NYU, N?E is written as NUE, L? is written as LYU, and L?E is written as LUE.

Baidu Encyclopedia_Chinese Pinyin Scheme