What does slipknot's symbol mean?

Answer 1

Nine-pointed designs represent the Moon in the Tree of Life, the balanced astral plane where comes inspiration and guidance. The 9 is the final digit, the culmination of numbers and therefore symbolizes completion and eternity. There are many groups of 9 in our mythologies, including the nine muses and the nine Celtic Heros & Adventurers.

* As this specific design is also 3 x 3, we will mention that the "magic of three" is also present - mind, body, spirit, past, present, future, birth, life, death

Answer 2

the slipknot "s" was designed by joey jordison and simply stands for slipknot as for the 9point pentagram each point stands for a band member