What does the radical of the word Pi mean?

Pi radical:

Pi

Pi_Baidu Chinese

[Pinyin]

[pí]

[Definition]

1. A layer of tissue on the surface of animals and plants.

2. Products made of animal skins or furs.

3. A layer of things wrapped around the outside.

4. Surface.

5. Thin flakes.

6. High toughness, not brittle.

7. Dishonest and naughty.

8. Refers to rubber.

9. Surname.