Wings are the perpendicular lugs or projections in the side of a spear that prevent the spear head from entering too deeply into the target. Spears with these wings are often erroneously referred to as boar spears. Although boar spears often did sport these wings, many spears designed for combat used them as well.
Wings on armour are found on the poleyns and couters. They extend from these defences to aid in covering the crease of the arm of the knee which would otherwise be exposed. They might be decorated in different shapes and patterned.