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Like the symbolism. Lots of snake and apple tattoos have an angry looking snake, which is not what I want to go for; knowledge is good.

Hellsing

Alchemical Symbols. Makes me think of Fullmetal Alchemist: Brotherhood.

alchemy web

Riza Hawkeye Back Transmutation Circle

Transmutation Circle Fullmetal Alchemist Anime by EpicShoppe

fullmetal alchemist mustang transmutation circle - Google Search

5 amazing anime tattoos 18

FullMetal Alchemist Brotherhood: Homunculus Ouroboros Temporary Tattoo