Degree signs °
All of you have seen this sign at least at school. Degree ° is one of the most popular mathematic symbols used for measuring angles. Apart from school you can see this sign on every temperature indicator and all over the internet. As you may not already know, you can type ° deg text symbol right from your keyboard. I'll show you how to do it by using different techniques depending on your Operating System and tastes.
What degree means
The degree symbol, is a typographical symbol that is used, among other things, to represent degrees of arc (e.g. in geographic coordinate systems) or degrees of temperature. The symbol consists of a small raised circle, historically a zero glyph.
In the case of degrees of arc, the degree symbol follows the number without any intervening space. In the case of degrees of temperature, two scientific and engineering standards bodies (BIPM and the U.S. Government Printing Office) prescribe printing temperatures with a space between the number and the degree symbol, However, in many works with professional typesetting, including scientific works published by the University of Chicago Press or Oxford University Press, the degree symbol is printed with no spaces between the number, the symbol, and the Latin letters "C" or "F" representing Celsius or Fahrenheit. Read Wikipedia article on degree symbol to find out more about its meaning.
How to input degree symbol
Choose your system and find out.Windows
Shortcut technique that works on Desktops and most Laptops running MS Windows. You press Alt and, while holding it, type a code on Num Pad while it's turned on. Please, read a guide if you're running a laptop. You can type many frequently used symbols with this method.
Configure your keyboard layout in Windows so that you can type all additional symbols you want as easy as any other text. Takes about 5-10 minutes to set things up, but you'll be typing like a boss. You can assign degree symbol ° and any other text characters to your keyboard using this technique.
CharMap allows you to view and use all characters and symbols available in all fonts (some examples of fonts are "Arial", "Times New Roman", "Webdings") installed on your computer. You can input degree symbol using it.
Emoji on iOS (iPhone, iPad and iPod touch)
You can make frequently used technical non-fancy symbols like "√ ∑ π ∞ ∆ ™ © æ £ ¢" and åccénted letters on Mac using [Option] key. I've compiled a list of shortcuts in my article and explained how to open keyboard viewer. You can also use your Keyboard Viewer as an alternative to my list.
[Option] +  produces ° degree sign.
Character Palette allows you to view and use all characters and symbols, including degree, available in all fonts (some examples of fonts are "Arial", "Times New Roman", "Webdings") installed on your computer.
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Character map allows you to view and use all characters and symbols available in all fonts (some examples of fonts are "Arial", "Times New Roman", "Webdings") installed on your computer. It can also help you lookup Unicode codes for entering symbols with keyboard.
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