Rifthome Axe

Rifthome Axe is an enchanted throwing axe +3 which returns instantly to the wielder after being thrown. It inflicts 1d6+3 points of damage and it has +3 THAC0 bonus. It weighs 2 lbs. and has a speed factor of 1. One needs at least 4 Strength to wield this weapon.

Baldur's Gate II: Shadows of Amn and the Enhanced Edition

 * Docks District - dropped by one of the Shadow Thieves with Mook if you side with Bodhi in Chapter 3

In-game description
"This axe of hurling is one of the most heavily enchanted weapons of its type. Its marking are vaguely dwarven, but no dwarf yet encountered of Faerûn has claimed a kinship with the maker. This causes some to speculate that it may not be the product of a terrestrial dwarven hand, rather some extraplanar variant. Dwarves laugh this off, off course, claiming the maker likely has no time for nosy scholars."