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An arrow flattening a flap open and down.
Also known as: Squash fold arrow, Open and flatten fold
In the Yoshizawa-Randlett notation a squash fold arrow instructs that a flap be opened and flattened symmetrically down onto the model.
An arrow pointing down into a flap with a small hollow arrow beside it showing the direction of opening.
A fuller structured visual breakdown is not yet documented for this symbol.