z (EN)

letter, symbol

letter “z”

1. the lowercase form of the letter "Z"
   Mellen Iech un, fir d'Iwwersetzungen vun den Beispillsätz an d'monolingual Definitioune vun all Wuert ze gesinn.

   The word "zip" starts with the letter "z".

symbol “z”

1. a real variable in mathematics when x and y are already being used
   The the equation is x + 2y + 3z2 + u = 7.
2. a complex variable in mathematics
   Let z = x + yi, where x is the real part and y is the imaginary part of the complex number.
3. the third coordinate in 3D Cartesian system in mathematics
   In the three-dimensional system, a point can be represented as (x, y, z).
4. the value of a standard normal random variable in statistics
   In our study, z > 2 indicated that the test results were significantly above average.
5. symbol for the atomic number in chemistry
   In the periodic table, the element oxygen has a z = 8, indicating it has 8 protons in its nucleus.
6. symbol for the redshift in astronomy
   Astronomers measured z = 1.5 for the distant galaxy, indicating it is moving away from us at a significant speed.