An L-shaped square essential for preparing a stone block and checking true right angles.
Squadra is a fixed L-shaped square. Le voci del marmo calls it indispensable for preparing the block and checking right angles.
It should be distinguished from adjustable forms such as the regional squadra zoppa and the bevel square.
Etymology
Italian squadra, “square.”
Sculptor Notes
Before a block can be measured reliably, the carver needs trustworthy reference planes and angles. The square helps turn an irregular quarry mass into a measurable working volume.
References
https://levocidelmarmo.sns.it/scheda_oggetti_relazione.php?denom=squadra&id=34