The Sigil of Lucifer was first documented in the 16th century (1517) Grimoirium Verum also known as the Grimoire of Truth. The document was allegedly authored as a practical guide to invoking and working with Lucifer, Beelzebub and Astaroth, and their lesser demons but it is very much steeped in Judeo-Christian religious dogma and the rituals and invocations should not be trusted from a Satanic or Left Hand Path perspective.
The purpose of the Sigil of Lucifer is that of an instrument of visual invocation during ritual. By performing the appropriate ritual, the sigil acts as a gateway to invoke and bestow the power and presence of Lucifer. Contrary to popular belief, the sigil was never intended or created as an identification symbol or manor crest. However, many modern Satanists use the sigil as an emblem as well as for its original intent, as a very powerful instrument of ritual. Luciferians use this sigil as well but also have their own distinctive version that they use on a more widespread basis.
Over many decades the graphical elements of the sigil have been identified with specific characteristics. The overall sigil appears as a chalice, which represents creation, the fertile darkness awaiting and ready for untold possibilities. It must be pointed out as this sigil is an instrument to invoke Lucifer, that Lucifer is considered to be the bearer of light and wisdom into the darkness (that has been invoked through this sigil).
The ‘X” over the sigil indicates the power and realm of the physical plane; its passion and sensuality that drives all entities. The inverted triangle represents water, often referred to as the original “Elixir of Ecstasy” without which physical life could not exist. The “V” at the bottom of the sigil represents the duality of all things; dark and light, male and female and the power of convergence of the two into one manifesting balance, creation and existence." "The Sigil of Lucifer is also known as the Sigillum Luciferi, Sigillum Diabolus, Sigillum Satanas, Sigil of Satan and Seal of Satan.