Chou Collection, Upper Volume
Radical: Mouth (kǒu)
Na; Kangxi strokes: 7
Page 179, Entry 02
Collected Rhymes (Jiyun) and Correct Rhymes (Zhengyun): Pronounced nu. Same as ne.
Collected Rhymes (Jiyun): Sometimes written in a variant form (qu).
Jade Chapters (Yupian): Slow and awkward.
Collected Rhymes (Jiyun): Difficult to speak.
Book of Rites (Liji): His speech was hesitant, as if it could not leave his mouth.
History of the Former Han (Qianhan): Li Guang was taciturn and spoke little. Commentary: Na is also the character for ne.
Biography of Bao Xuan: Na is slow in speech.
Also, according to Collected Rhymes (Jiyun): Pronounced ru.
Rhyme Collection (Yunhui) and Correct Rhymes (Zhengyun): Pronounced ru.
Collected Rhymes (Jiyun): Slow speech. Sometimes written in a variant form.
Also, according to Broad Rhymes (Guangyun) and Collected Rhymes (Jiyun): Pronounced rui.
Broad Rhymes (Guangyun): The sound of guna, sound unable to emerge.
Collected Rhymes (Jiyun): Sometimes written in a variant form.
Also, according to Collected Rhymes (Jiyun) and Rhyme Collection (Yunhui): Pronounced duo. Unclear speech.
Note: The characters na and ne are similar in sound and meaning. However, Jade Chapters (Yupian) and Broad Rhymes (Guangyun) list them separately and do not state that na is identical to ne; only Collected Rhymes (Jiyun) treats the two pronunciations of ru and rui as having no difference between na and ne. The character is written with an internal mouth component.