Alpha
On Windows, hold Alt and type 224 on the number pad, then let go of Alt.
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About the alpha
Alpha comes from the Phoenician letter aleph, whose name was the word for ox. Joined with beta, the second letter, it gave us the word alphabet.
In 1899 Ernest Rutherford named the less penetrating radiation from uranium alpha rays. Ten years later he and Thomas Royds showed that alpha particles are helium nuclei.