A traditional Apuan–Versilian adjustable square with one movable arm, used to transfer or check angles other than a fixed right angle.
The ordinary squadra is an L-shaped square essential for preparing blocks and checking right angles. Le voci del marmo records a regional Apuan–Versilian variant called the squadra zoppa, fitted with a movable arm held by a clamp so that different angles can be set.
Etymology
Italian: squadra, “square,” + zoppa, literally “lame”; regional workshop name for the adjustable form.
Sculptor Notes
This is a particularly valuable regional shop term. The adjustable arm allows an angle to be taken from one form and transferred directly to another without reducing the operation to numerical degrees.
References
https://levocidelmarmo.sns.it/scheda_oggetti_relazione.php?denom=squadra&id=34