What is the meaning of Pavis?

Most usually, a very large shield fitted with a stand, like a small moveable wall, carried in front to protect all or most of the bearer's body that could be positioned independently of the user, such as a crossbowman, often with a projecting ridge running vertically down the center. However, smaller, more standard shield types were also termed as such, with the central verticle ridge as a defining feature.

dative/ablative plural of pāva

Source: wiktionary.org