Lambda or lambda as well as right?

Initially, the characters Λ, λ occurred in the Greek language from the ancient Phoenician language, which was letter — land. But for ease of pronunciation of this sound is the sound of "I" is lambda. Of that letter occurred the Latin letter L and the Cyrillic letter L. All the teachers that have learned from me and teach current students say "lambda". Example sign and λ is the wavelength of light in physics and it refers to the overload capacity of the motor.
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