Much like banner patterns, they have pre-defined poses for armor stands. Bedrock edition poses and some other poses are added via these pattern items. You can right click with one on an armor stand to change its pose.
Wrench Item
Allows the player to rotate blocks that have a direction property, similar to how a debug stick works.
Allows the player to customize the pose every part of an armor stand with sliders.
Custom poses can be stored with blank armor stand patterns.
