Smiling face
On Windows, hold Alt and type 1 on the number pad, then let go of Alt.
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About the smiling face
IBM’s first PC, launched in 1981, had a built-in character set now called code page 437, and its character number 1 was this smiling face. Windows still honours that old table, which is why the oldest Alt codes produce ☺.
Unicode calls an outline shape “white”, so ☻, the solid counterpart, has the name black smiling face.