z-score the z-score measures how a score compares to the average in a group. A negative z-score means below average, a zero z-score is exactly average and a positive z-score is above average.$$z=\frac{x-\overline x}{sd}$$ where x is the score, $$\overline{x}$$ is the average and sd is the standard deviation
zero 0, nought. Zero has no value, it is neither positive or negative
zero is often referred to as the zero of an equation, or the roots, the x-intercepts. To find the zeros of an equation, set y = 0 and solve for x
zeta Greek symbol Ζ  (capital), ζ (small)

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