Depends on what application you're using. MS Word will put it in automatically if you type (c). Otherwise: Go to Start>Programs>Accessories>System Tools>Character Map. Find the symbol you want, copy to clipboard, paste. There are shortcuts for some symbols and accents, etc, but they can be different depending on your keyboard configuration.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire