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A dotted line showing an edge hidden inside.
Also known as: Hidden edge line origami, Concealed layer line
In the Yoshizawa-Randlett notation a dotted line shows an edge or a layer concealed within the model, letting a diagram convey structure it cannot show directly.
A finely dotted line drawn across the model where an edge lies beneath the visible surface.
A fuller structured visual breakdown is not yet documented for this symbol.