| Large couter(The left couter on this armour has large wings to protect the inside of the arm.)
Smaller couter(The right couter here is smaller.)
Additional information on historic armor]
A couter of an Austrian imperial armour, Kunsthistorisches Museum, Vienna, Austria
The couter (also spelled "cowter") is the defense for the elbow in a piece of plate armour. Initially just a curved piece of metal, as plate armor progressed the couter became an articulated joint.
In fighting reenactment groups such as the Society for Creative Anachronism, a couter/cowter is often called an elbow cop.