you need to know which is the numeric keyboard. See on right side of your keyboard, that it is the numeric keyboard. Look at the picture below.
This trick just used a keyboard to make various symbols that you like. How does it work? Just press and hold Alt and at the same time press numeric numbers on the numeric keyboard. I will give you examples.
Alt + num 1 = ☺
Alt + num 2 = ☻
Alt + num 3 = ♥
Alt + num 12 = ♀
Alt + Numeric Numbers = a symbol
How if I use a notebook? just press and hold Fn and at the same time press and hold Alt then press numeric number (numeric number usualy on J, K, L, M, U, I, O, 7, 8 and 9 keys on your notebook keyboard).
So, the formula gonna be like this.
Alt + Fn + Numeric Numbers = a symbol
Thanks, and wait for other interesting tricks. see you.