24 Feb 2023
The weapon is not https://en.wikipedia.org/wiki/Batik 
Batik is a dyeing technique using wax resist. The term is also used to describe patterned textiles created with that technique.
Thanks to the comments. It is https://en.wikipedia.org/wiki/Badik 
The
 badik or badek (Makassarese: ᨅᨉᨗ badiʼ, Buginese: ᨀᨓᨒᨗ kawali) is a 
knife or dagger developed by the Bugis and Makassar people of southern 
Sulawesi, Indonesia.   
Hahaha, h0ngcom don't believe them at first, because the pictures looks staged. The US' standards are still trustable in my mind. --h0ngcom.