Hey wanna join a descrete math club I am part of?

Jim: Hey Alex, wanna join a descrete math club I am member of?

Alex: Uhhh, ya sure. I like math!

Jim: Cool! There is one hitch though, you have to get tattoo...

Alex: Hmm, well I've always wanted a tattoo, this just gives me a good reason I guess!

Tattoo artist needles an equiangular triangle.

Alex (in pain): Ahhhh, I don't want to look.

Tattoo artist then needles an eye in the center...

Alex: Is it over yet?

Jim: Yep! All done!

Alex (looks at tattoo): WTF!!! YOU SAID THIS WAS A MATH CLUB.

Jim: I also said it was discreet :)