An urumi (Malayalam: uṟumi; Sinhalese: ethunu kaduwa; Hindi: āra) is a sword with a flexible, whip-like blade, originating in modern-day Kerala in the Indian subcontinent. It is thought to have existed from as early as the Sangam period. [~600BC-300AD]

The urumi is handled like a flail but requires less strength since the blade combined with centrifugal force is sufficient to inflict injury. As with other “soft” weapons, urumi wielders learn to follow and control the momentum of the blade with each swing, thus techniques include spins and agile manoeuvres.

These long-reaching spins make the weapon particularly well suited to fighting against multiple opponents. When not in use, the urumi is worn coiled around the waist like a belt, with the handle at the wearer’s side like a conventional sword.

https://en.m.wikipedia.org/wiki/Urumi