this is the aquarian triangle used by mudvayne in the early 2000's
it's a combination of two symbols. The triangle itself is normally associated with the holy, divine number of 3. However, it also stands for power, and it also stands for danger. However, according to the law of polarity of meanings of the elementary graphs, it can also stand for safety and success or prosperity.
The upside down Y symbol is normally associated with a symbol for being male. However, turned right side up, it can mean "the choice between good and evil."
Aside from all of that. not much is known about this peice of symbolizm. the band mudvayne uses/ or used this symbol on there album:end of all things to come