So here on the forum we focus on programming and such. So on the calculator there are certain characters that you see on there but may not be on your common keyboard or something. To help with this I have found a way that will display these characters. They are called Alt Characters. They can be very helpful and useful. However, though I've never heard of this happening, some browsers may not recognize them correctly or at all.
These are for Windows users, as far as I know. I do not know if you can access them the same way on other operating systems.
How you access these characters is that you hold down the Alt key and push the numbers in on the number pad, I do not know how to get them to work on the numbers line.
The Alt characters are good, but sometimes they just don't include the character you need. When that happens, you need theUnicode Character Set
. The article linked contains SOME of the hundred thousand or so Unicode characters. If you can't find the right character elsewhere, then chances are it's somewhere in Unicode. The downside to having that many characters is that the Unicode characters sets in web browsers are necessarily incomplete, so someone else using another browser might not be able to read what you type.
For example, this is the [Time Independent] Schrodinger equation:
--- = -------------
All of the funny little characters are Unicode characters because the Alt-code character set does not contain the proper symbols (with the exceptions of the partial derivative symbol ∂ and the squared symbol ².