A level used to establish precise horizontal alignment and to position sculpture accurately in relation to its site.
Livella is the Italian term for a level. Le voci del marmo notes its use for determining precise horizontal lines and establishing the position of sculpture relative to its placement in space.
Etymology
From Italian livello/livella, relating to level or horizontal alignment.
Sculptor Notes
For installation and monumental sculpture, level is part of composition. A base that is technically only slightly out can change the perceived balance, stance, and relation of the figure to architecture.
References
https://levocidelmarmo.sns.it/scheda_oggetti_relazione.php?denom=livella&id=33