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.
No matter pretendyd, nor nothyng enterpryſed But that metaphora, alegoria with all Shall be his protectyon, his pauys and his wall
For in this proceſſe, Parrot nothĩg hath ſurmyſed
Where it comes from
From Middle English pavis(e) (paveis, pavas), from Anglo-Norman pavis (compare French pavois), from Latin pavensis, probably from Pavia in Italy. Compare Italian pavese.
Adapted from the Wiktionary entry pavis (CC BY-SA 4.0).