A 69 tattoo can mean many different things depending on who you ask. It can symbolize the number 69, or two people working in harmony and unison. It can also relate to the sex position of the same name, or simply be a sign of friendship between two people. In some cases, 69 may also be a symbolic representation of good luck, since the number 6 often symbolizes fortune. Ultimately, the meaning behind a 69 tattoo may be personal to the individual and could carry its own unique interpretation.