@Icon,
i have one small tattoo on my foot. it's a trinity knot. my sister, mom and i all got some sort of variation of the knot. so for one, it reminds me of my connection to the females in my family.
it's strongest meaning has to do with the power of three. i feel like this number has some sort of significance in the universe. many things come in three. mind, body soul. past, present, future. left, right, middle. sperm, egg, offspring. (father, son, holy spirit- but im not a traditional theist). heaven, hell, earth. there some sort of balance with three. everything is on a spectrum with two opposites and a middle.