Single block

A pulley block with one sheave.

How to sign

Use Dominant 1-hand rotates; dominant R-hand traces rope after the rotation. The base or passive hand is Non-dominant curved-C: one circular block housing. Form one small curved-C housing. Place the index inside it. Rotate the index once inside the housing, then run the rope classifier over the housing. End with one visible sheave and rope passing over it. Show a small C-hand circular housing. With the other index, rotate once inside it to represent one sheave, then run an R-hand rope over it.