Wikipedia
Haladie
The haladie is a double-edged dagger from ancient Syria and India, consisting of two curved blades, each approximately in length, attached to a single hilt.
The weapon was used by warriors of the Indian Rajput clans, and was both a stabbing and slicing blade. Some haladie had spikes on one side of the handle in the style of a knuckle duster, while others had a third blade in this position. In some cases the main blades would be serrated.
The haladie is believed to be one of the worlds first triple edged blades.