Marker Entities
Marker Entities are a vanilla minecraft1 feature which was added in 1.17. Essentially, they are entities that have little to no behaviour. Axiom takes advantage of this and provides a Gizmo to control the marker.
Right-clicking the marker gizmo will open a menu, allowing you to input custom NBT for the marker.
Using Ctrl+C
while the gizmo is active, will copy the marker data to the clipboard. Using Ctrl+V
will paste the copied marker into the world.
Marker entities cannot be spawned using axiom.