depending where it is it might.
i think that might look quite cute if it was on the back of your neck.
i did a google of numeral systems...
there's a mayan one where 3 is just like ... which is different and not like OMG THREEEEE!
devanagari (hindi) is like a 3 with a little tail and looks kind of like a sprial which is cute:
the "tamil" one is kind of cool.
there's something called hexabill:
you could always do what people do with logo design. Like just sit and doodle threes and try different fonts or ways you know to represent three or different stuff and come up with your own three symbol.
i know you said numeral system but still...alternatives!
i found this (i look for number tattoos and this comes up]
you could do it like that and have something on the inner section on something
there's this guy:
the title thing under the photo says "tribal numeral of number two" but i couldnt find tribal numerals on google >.<
also
roman numeral three! you wouldnt need the fire of course but you could do something with it.
thats all i could find atm