Correct

蛇形

/ shéxíng / 
Strokes

Definition

S-shaped/serpentine/coiled like a snake

Example

As an Adjective

snakelike; S-shaped; snaky

1
Shéxíng
蛇形
zhàlán
栅栏

snake fence

2
Shéxíng
蛇形
hángxiàn
航线

zigzag course

3
Shéxíng
蛇形
duìxíng
队形

S formation