Last summer, Nebus Research had a fun series on the definitions of 26 different mathematical terms, one for each letter of the alphabet. Here are the words from U to Z:
U is for unbounded, which comes up again and again in calculus.
V is for vertex, as used in graph theory (and not a special point on a parabola or a hyperbola).
W is for well-posed problem, which essentially means “satisfies a set of conditions so that the problem can be numerically solved.”
X is for xor (or exclusive or), a concept from discrete mathematics and logic.
Y is for y-axis, a common notion from algebra class that gets surprisingly deeper once students are introduced to linear algebra.
Z is for z-transform, a notion from signal processing.
Mean Green Math 
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