A bounty emblem (t10) is an item used in Bounty Hunter. If another player is killed while the killer is carrying a bounty emblem (t9) it has a chance of being upgraded to this item. It can be converted into 40,000 Bounty Hunter points by clicking on it. This is the highest tier emblem and cannot be further upgraded - it should be converted to avoid losing it.
The chance of upgrading an emblem is significantly higher when killing your bounty target as opposed to anyone else ('rogue' killing).