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You must seal all of your magical works, invocations, supplications, healing chains, etc., with the Rune Sig. The zig zag of lightning must be traced with your hand and your extended index finger, at the moment when you also sound the letter SSSSSSSSSSSSSSSSSS as a prolonged sweet and affable whistle.
Samael Aun Weor
Esoteric Treaty of Runic Magic, Chapter 13
NOTE: Ceremonial magic indicates that the drawing of this Rune can be made either with the index finger of the extended right hand, as well as with the three fingers (thumb, index, and middle fingers) of the same hand, equally extended, in order to represent the Three Forces.