DarkMaster explained , "popular" new-age "chaos" method or making sigils
Traditionaly they are made by inscribing them on certain KAMEA/S then copying them to parchment using right magickal ink or blessed pen , vibratting word of power or the very sigil word and visulizing energy flowing into sigil. Than the sigil is carried in puch bags ( mojo bags , hex bags or medicine bags ) burnt or used in other manner.
Some inscribe them on candles. Sigils are not always words translated to numbers and thpose translated via KAMEAS to sigils , they can be runes , bindrunes , combined alchemic symbols , enochian inscritions , occult themed drawings etc