λ was not invented by scientists, but a Greek letter. The Greek alphabet originated from the Phoenician alphabet, which has only consonants and is written from right to left. The vowels in Greek were developed, and the Greeks added vowels. Because the Greek writing tool is a wax board, sometimes the first line is written from right to left, and then from left to right.

Extended data:

The meaning of λ:

1, wavelength, the shortest distance between two particles with the same displacement and time from the equilibrium position at a fixed frequency.

2. Exponential attenuation

3.λ calculus

4. A parameter of Poisson distribution.

5. Eigenvalues of matrices

6. Arrival rate of waiting theory

7. Parameters of exponential distribution

8. Failure rate

9. Average

10, latent heat of melting

1 1, Lagrange multiplier, also applies to the shadow price of economics.

12, Lebesgue measurable set's Lebesgue measure is equal to the volume of this set in the usual sense.

Longitude 13

14, linear density

15, the ecliptic meridian is the coordinate value used to determine the position of celestial bodies on the celestial sphere in the ecliptic coordinate system.

16, liouville function

17, Carmichael function

18, equal to one microliter (1? L) or one cubic millimeter (1 mm? ) 1 microliter = 1 cubic millimeter

An empty string in computer science.

Planck, a physicist and thinker, calculated the Planck constant.

Baidu Encyclopedia-Greek alphabet