A TAKRUT is rolled up metal foil that is inscribed with yants. A Yant is a sacred geometry design incorporating Buddhist psalms and magical formulas that invoke various elements and powers of protection and various blessings. The Buddhist psalms written within and around these yant are know in Thai language as "kata". A kata is what we might call in the West a "Mantra", the word Mantra is a Sanskrit word meaning "prayer”. The casting of a magic spell is similar to the recitation of a Mantra in the sense that the concept of invocation / evocation is inflected in order to achieve a certain result. The ancient tradition of tattooing a sacred yant is probably at least one to two thousand years old. The oldest definite historical evidence of sak yant being practised in Thailand dates back to around the times of King Naresuan Maharaj, around the time that the kingdom of Ayutthaya was still in its golden age. The warriors were tattooed with Yant and also wore "Suea yant" (yant shirts, that had protective designs intended to ward off the blows of sharp weapons inscribed all over the surface). The Yant designs themselves are not the only element necessary to enable the magic power believed to be contained within these sacred geometrical designs. Many Buddhists believe in the power of the Yant. Some Yants are meant to protect against physical harm (Kong Grapan Yant) whilst others are meant to bring good luck (Maettha Yant).

Since the time of King Naresuan (สมเด็จพระนเรศวรมหาราช), Thai soldiers have sought protection from the power of sak yant and the wearing of amulets. In the Korean, Vietnam and second world wars, Thai soldiers were nicknamed “tahaan pee” (Thai: ทหารผี) or "ghost soldiers" by the allied forces, because of their sak yant tattoos and amulets.