rho; Ρ, ρ +
(Greek: the seventeenth letter of the Greek alphabet; Ρ, ρ)
1. The 17th letter of the Greek alphabet, represented in the English alphabet (P, ρ) as "r" aspirated.
Of Phoenician origin.2. In the system of Greek numerals, it has a value of 100.
A very short-lived unstable meson with mass 1490 times the mass of an electron.
It plays an essential role in the electrical structure of nucleons.
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