What is dark mark tattoo?

The dark mark tattoo is a symbol used by the followers of Lord Voldemort in the Harry Potter series. It is a skull with a snake protruding from its mouth, and represents the loyalty of the wearer to Voldemort and his ideology of pure-blood wizard supremacy.

In the series, the dark mark tattoo is also used as a means of communication between Voldemort and his Death Eaters, as it can be summoned to summon a meeting or to alert them to his return.

However, it should be noted that in the real world, the dark mark tattoo should not be taken as a symbol of admiration or support for Voldemort's beliefs, as they promote bigotry and hatred. Its use should be avoided.