Here are some I found for math, but at the middle bottom they have astrology signs and planets.
Ok, here is the easiest way. Find the character you want, highlight it, do Control C, and then just paste Control V into the text where you want it.
This may not work with everyone's computer. It depends on your keyboard, browser and type of computer.
http://www.mistywindow.com/reference/html-characters.htm
You are Capricorn? ♑
You can highlight what I just wrote and copy/paste it.
♈
♉
♊
♋
♍
♌
♎
♏
♐
♑
♒
♓
If that doesn't work, here are the detailed pia instructions:
Memorize the code.
Make sure your NumLock key is activated.
Position your curser where you want the code to go.
Hold down the Alt key while you type the code.
(You must use the numerical keypad instead of your numbers at the top of your keyboard.)
Let go of the Alt key.