The ham logo is worn by H.A.M. members. It is an amulet/necklace, worn as part of the H.A.M. robes set. When worn, players are slightly less likely to be kicked out of the H.A.M. Hideout when pickpocketing male and female H.A.M. members. Wearing this will not increase player's chances of success pickpocketing, however.
Can be obtained via pickpocketing H.A.M. members, by killing H.A.M. Guards, or by trading with other players. It is not sold in stores.