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pion

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pion

In physics, a subatomic particle with a neutral form (mass 135 MeV) and a charged form (mass 139 MeV). The charged pion decays into muons and neutrinos and the neutral form decays into gamma-ray photons. They belong to the hadron class of elementary particles, and consist of pairs of quarks.

The mass of a charged pion is 273 times that of an electron; the mass of a neutral pion is 264 times that of an electron.



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By-and-by they came to a marvelous cave in the Hill of Pion and entered into it and feasted, and presently they hurried on again.
The Innocents Abroad by Twain, Mark View in context
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