It depends what shield-
Bella's shield on protects those under her shield from mind power eg. Edwards gift to read minds, Aro's mind reading gift, Alec's gift to immobilize physical and emotional self.
Where as Renetra (Aro's personal bodyguard) can deflect and physical contact.
They had a big shield to protect their whole body!
Virus shields protect your computer from the viruses.
Face shields are designed to protect you from fumes.
Shields (Greek Hoplon or Roman Scutum) are used primarily to protect the body and can be used , in a phalanx , to push the enemy back to upset their forward momentum .
to protect it
that knights protect themselves
The purpose of the shield was twofold. First it was a protective device, preventing javelins, arrows or sword thrusts from hitting the man. Secondly, it could be used as an offensive weapon by pushing the opponent off balance.
often used by indians, blanket and copper shields were something used to protect themselves
The main benefits of nipple shields are to protect the nipples of a breastfeeding mother. It has been said that nipple shields in general should be used as a short term solution.
Brooke Shields was under age. a body doulble was used.
Safety glasses and face shields are used to protect the faces of silversmiths and many other occupations.
A poncho is garment, usually a flat cloth, used to protect against rain and the elements. The poncho will have a single opening for the head, while the rest of it drapes across, and shields the body.