The sound radical is the (sound) radical.

Analysis:

The phonetic character itself is a radical.

音

Pronunciation: [yīn]

Radical: 音

Definition:

1. Sound ; Pronunciation: ~Lü. ~Le. Mouth~. Happy~. Miscellaneous ~. Pronounce the word ~ ??correctly.

2. News: Good~. ~ Letter.

3. Refers to syllables: single words. Complex ~ words.

4. Pronunciation (a certain pronunciation): When the word "Di" is used as a surname, it is ~ European.

5. Surname.

Illustration