Ξ

Xi (zEYE) Xi is the fourteenth letter of the Greek alphabet. It has a numeric value of sixty. The lowercase Xi symbol is used in particle physics to represent momentum loss. It also represents random, dimensionless distance, and proportional variables. Robotic mapping uses the Xi lowercase symbol to represent the information vector. It also is used to represent the extent of a reaction. It represents microturbulence velocity, unknown stereochemistry, the diameter of a crystal nucleus, parameter, state price density, systematic function equation, Pippard’s cohesion length, eigenvectors, killing vector, damping ratio, radio integral, universal set, potential difference, initial mass function, and spatial frequency in mathematics and science.
The uppercase Xi symbol is used in cryptocurrency. It is also used in particle physics to represent the cascade particles. In mathematics, there is a Riemann Xi function. In computing systems, the symbol indicates no change of states. In statistical mechanics, the uppercase Xi is used to represent partition function. The uppercase Xi symbol appears in different logos including ZEA, a band, Razer, and musician Banners.
Simply Put: XPledge, if you join and hate it you can leave anytime. 