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U is the letter most similar to V - there are lots of times when, if V is used as a variable for a concept, then U is a variable for a similar concept. So potential energy became U, because someone might have been trying to make a connection with potential voltage.
24 sie 2004 · An underlined U can have various meanings depending on the context. It could represent a mathematical symbol for union, a unit vector in physics, or the symbol for uranium in chemistry. Why is the U underlined?
Symbols representing physical quantities, units, mathematical operations and relationships, astronomical bodies, constellations, and the Greek alphabet.
As mentioned by others, there are too many symbols to talk about all of them, but here are some major ones that a) I use a lot and b) possibly explainable at ELI5 level. Sigma (big trangular E): Sums up a whole bunch of chunks of info, with each chunk being a little different.
Many people have made use of, or invented, units of measurement intended primarily for their humor value. This is a list of such units invented by sources that are notable for reasons other than having made the unit itself, and that are widely known in the Anglophone world for their humor value.
Both of voltage description "U" and "V" are proper, however it must be mentioned that in European notation "U" describes voltage source while "V" describes rather voltage potential. It means that U = V1 - V1 (voltage is a difference between voltage potentials).
u U υ Υ upsilon: u = initial velocity. u = image distance. U = U-value. U = internal heat of a system. u = atomic mass unit (mass at atomic levels) v V v = velocity. v = final velocity (when used in conjunction with 'u') v = image distance. V = volume
