Encyclopedia of historical weapons - Boss

Also umbo. The round shaped piece of metal at the center of a shield. Protects the hand.

Encyclopedia of historical weapons

From Encyclopedia

Francisca
Light throwing axe used alongside an angon.
Skull
The part of a helmet cover­ing the top, back and the sides of the head above the ears. It can also denote a simple metal cap.
Ventail
An integral flap of mail attached to the coif in the thirteenth century; it could be drawn across the mouth to protect the lower face.
Eccat
Sword with a deer horn hilt and no guard.
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