z (EN)

letter, symbol

letter “z”

1. the lowercase form of the letter "Z"
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   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.