The Kirpan (Punjabi: ਕਿਰਪਾਨ, kirpān) is a religious sword worn in a strap that enables a it to be suspended near one’s waist or tucked inside one’s belt.It must be worn by all initiated Sikhs (Khalsa), after a mandatory religious commandment given by Guru Gobind Singh Ji (the tenth Sikh Guru) in 1699 CE.
: http://www.sikhanswers.com/modern-youth-issues/legal-standing-on-sikhs-wearing-kirpan/

