Arnis, also known as Kali or Eskrima/Escrima, is the national martial art and sport of the Philippines according to Republic Act 9850 signed in 2009. Arnis was developed by indigenous Filipino populations as a means of combat and self-defense using weapons like sticks, knives, and machetes. There are different styles of arnis depending on the combination of weapons used and techniques trained, and it involves empty hand techniques as well as weapons.