What does the triangle shaped tatto on inside of Michael Myers wrist mean?

There is no official information about the meaning of the triangle tattoo on Michael Myers's wrist. This tattoo was not part of the original film and was only added in later films.

Some fans have speculated that the triangle could represent:

* The shape of the mask: Some fans believe it's a simple reference to the shape of Michael's mask.

* A symbol of evil: Others interpret it as a symbol of evil or darkness.

* A connection to the occult: There's a theory that the triangle could be related to occult practices or symbols.

However, it's important to remember that these are just fan theories and there is no official confirmation of any specific meaning. The filmmakers themselves have never explained the significance of the tattoo, leaving it open to interpretation.

Ultimately, the meaning of the triangle tattoo is up to you to decide. It could be a simple design choice, a symbolic representation of Michael's evil, or something else entirely.