How can I get "WHITE SMILING FACE (U+263A)" with the keyboard?
3 Answers
In Windows you can:
Left Alt + 1 : ☺
But the number must be from the Numeric Keypad
You can also:
Left Alt + 2 : ☻
Left Alt + 3 : ♥
Left Alt + 4 : ♦
Left Alt + 5 : ♣
Left Alt + 6 : ♠
Left Alt + 7 : •
Left Alt + 8 : ◘
Left Alt + 9 : ○
Left Alt + 10 : ◙
Left Alt + 11 : ♂
Left Alt + 12 : ♀
Left Alt + 13 : ♪
Left Alt + 14 : ♫
Left Alt + 15 : ☼
Left Alt + 16 : ►
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In Ubuntu (and variants thereof, like LinuxMint) you can enter Unicode values by pressing Ctrl+Shift+u followed by the Unicode value and Enter, for example:
Ctrl+Shift+u 263a yields:
Text: ☺
Screenshot: 
You might be able to couple this with AutoHotkey for easier input, or possible input in Windows.
its really fun to make the white smiley and it's really easy once you know how to make a white smiley. All you have to do is click the left alt and click the number 1 one the number pad thing.☺ and there you go, you get a white smiley.