Baselard

The baselard (also Basilard, the name is probably from the town of Basel) or Swiss dagger (Schweizerdegen) is a historical Swiss blade weapon with a crescent-shaped pommel and crossguard. The baselard's characteristic hilt features a crescent-shaped pommel and crossguard. Their curved shapes appeared as early as the 13th century and remained peculiar to Switzerland, and do not appear to have been imitated elsewhere. This distinctive hilt design can be made out in many works of Hans Holbein, for which reason the Swiss dagger was sometimes also called a Holbein dagger. Their blade was characteristically double edged, tapering to a point and was, on earlier examples, sometimes diamond shape in cross-section. This form would lend a great deal of strength to the blade, especially useful for piercing armor. The Cgm 558 Fechtbuch mentions a few techniques for unarmed defense against an attack with a baselard.
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(n.)
A short sword or dagger, worn in the fifteenth century.
  

A knife or short sword bearing a hilt in the shape of the letter 'I', originating in southern Germany during the late 13th century. It quickly became the weapon of choice for many footsoldiers.