want to learn how to make these symbols: ??????????????

ok well i just learned how to just by messing with the key board, everybody says alt+3 to make the heart but it doesn't work. other ppl say ♥ but thats only for the heart. i leaned if u press and hold the fn and the alt then press "l" u get this ???, u can mix different one's like this fn+alt+k+j (then let go)= ??
so go ahead experiment with different one's (note this might not work for all(i have a toshiba laptop and thats how it works)