Greek Letter Alpha (Άλφα - Α)

Alpha

A is the first letter of the Greek alphabet and it derives from the Egyptian hieroglyphic for a horned ox's head, by way of the semitic "aleph", which today doesn't look at all ox-like. Contemporary "A", like its Greek ancestor, has the horns pointed downward.

"A" Letter in mathematics and in science

α represents:

  • the first angle in a triangle.
  • one root of a quadratic equation, β represents the other
  • the statistical significance of a result
  • the false positive rate in statistics
  • the fine structure constant in physics which characterizes the strength of the electromagnetic interaction
  • Alpha particles that consist of two protons and two neutrons bound together into a particle identical to a helium nucleus; (He+2)
  • Angular acceleration in physics
  • the linear thermal expansion coefficient

Greek words with "α"

αλήθεια, γάτα

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