It's All Greek to Me Trivia Quiz

Answer:

All of the terms in this collection quiz are used in different scientific fields, from mathematics to engineering, and some in biology when naming animal species. Every Greek alphabet term is used in mathematics or various sciences, often denoted just by the letter's symbol. Probably the most commonly known ones, whether you are scientifically-minded or not, are pi (π) - the mathematical constant that is the ratio of a circle's circumference to its diameter - and delta (Δ) - a symbol representing a change in something, commonly used in calculus.

And not only are these Greek alphabet letters used, they are used in multiple fields, and can represent different things, entirely, both as lower case letters and upper case letters. A prime example of this is the letter sigma, which is either σ (lower case) or Σ (upper case). In the lower case, it can mean "the Weierstrass sigma-function in math, the standard deviation in theoretical spectral analysis, the elasticity of substitution in macroeconomics, the volatility of stocks in finance, the damping ratio in electrical engineering, cross-sections and Pauli matrices in physics, velocity dispersion in astronomy, and "stress" in engineering fields," while as a capital letter, it is "used as a symbol for the covariance matrix in statistics, the busy beaver function in computer science, a class of baryons, and self-energy in physics." (quoted from the greeksymbols.net website)