A "Support 81" tattoo typically signifies allegiance to the Hells Angels Motorcycle Club and its affiliated support clubs, with "81" representing the letter "H" (the 8th letter of the alphabet) and "A" (the 1st letter).
For a woman associated with the Hells Angels, this tattoo often indicates her support for the club and its members, signifying loyalty and connection to the motorcycle culture. It can also imply a role within the community, supporting the lifestyle and values of the club.