Ear tag ear is tagged. Australian sheep and goats are required to have visually readable ear tags printed with a Property Identification Code (PIC). They are complemented by movement documents supplied by consignors that are used for identification and tracking. Very small ear tags are available for laboratory animals such as mice and rats. They are usually sold with a device that pierces the animal's ear and installs the tag at the same time. Lab animals can also be identified by other methods such as ear punching or marking (also used for livestock; see below), implanted RFID tags (mice are too small
Viking Age arms and armour spears were constantly used by the warrior class; despite popular belief, it was also the principal weapon of the Viking warrior, an apt fit to their formations and tactics. They consisted of metal heads with a blade and a hollow shaft, mounted on wooden shafts of two to three metres in length, and were typically made from ash wood. The spear heads could measure between twenty and sixty centimetres with a tendency towards longer heads in the later Viking Age. Spear heads with wings are called "krókspjót" (hooked spear) in the sagas. Some larger-headed spears were called "höggspjót" (chopping spear)