Vertical double block

A block with two sheaves arranged vertically.

How to sign

Use Dominant 1-hand rotates, then dominant R-hand traces rope. The base or passive hand is Non-dominant curved-C forms two housings stacked vertically. Set two small C-hand housings one above the other. Place the index in the upper housing. Rotate once in the upper housing, once in the lower, then trace the rope through both. End with two vertical sheaves and one continuous rope path. Show two small C-hand pulley housings stacked vertically. Rotate the index in each position, then trace the rope through both.