prov:value
| - abetical order used as a counting system, e.g. Plan A, Plan B, etc; alpha ray, beta ray, gamma ray, delta ray, epsilon rayThe shape of the letter, e.g. D-ring, F-clamp, G-clamp, H-block, H engine, O-ring, R-clip, U engine, V engine, Z-drive, a river deltaOther reasons, e.g. X-ray after x the unknown in algebra, because the discoverer did not know what they were.A Classical definitionGuilhem Moli
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