Pub names are used to identify and differentiate traditional drinking establishments. Many pubs are centuries old, and were named at a time when most of their customers were illiterate, but could recognise pub signs. The use of signage was not confined to drinking establishments. British pubs may be named after and depict anything from everyday (particularly agricultural) objects, to sovereigns, aristocrats and landowners (shown by their coats of arms). Other names come from historic events, livery companies, occupations, sports, and craftsmen's guilds. One of the most common pub names is the Red Lion.