Sword

The Sword is a melee weapon found in the Hong Kong area. The local Triads prefer to fight with traditional weapons which would account for their prevalance.

Uses
It doesn't receive much use because you find the Dragon's Tooth Sword shortly after finding a sword in the Cannal Road in Hong Kong and it is far superior. It's most important function is to break open the lockers within the MJ-12 Hangar.