Since 2006, CCP has given out medals to winning teams in the yearly alliance tournaments (gold, silver and bronze medals). In later years it has been sets of 12 medals, as each team can hold 12 pilots.
The medals are not inscripted with year, so they are interchangeable. Therefore, they are not truly a "relic" or "legacy" item in contrast to all other items in this wikipedia - they increase in number every year.
Unlike the Alliance Tournament Cup, the medals can be freely traded. Given their sentimental value, they are rarely seen for sale and fetch billions of isk.