Manufacturing rule for Topology Optimization: the result is mirror-symmetric about each plane. The half behind a plane's normal copies the half in front; flip the normal to swap them. One per solve, and not together with Repeating Pattern or Extrudable.
Mirror planes, at right angles to each other; normally through the middle of the part. Planes that are not orthogonal are refused.
Values the block gives besides its output. The editor lists them under Properties, and an input can read one by reference.
How far the Solid breaks the rule at each point, 0 where it is met; only there when a Solid is connected.
The steepest overhang allowed, measured against the build plate, in degrees.
The direction the part grows in, normal to the build plate.
The thinnest wall or smallest feature allowed.
The bound a Metric is held to (at most, at least, or equal).