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Delta (of a curve)
In chemcistry it means the 'Difference'
It means a change in. For example if you had Delta(y) that would mean a change in Y values in respect to another variable
Delta as a mathematical symbol usually means "change". It's usually used the same way in physics and chemistry, though it's sometimes used in chemical equations to represent heat.
it represents frequency
Uranium
Nb is the chemical symbol of niobium.
carbon mono oxide
H in chemistry mean hydrogen.It is the chemical symbol.
delta, or change in diagnosis
That pyramid symbol (or better defined as a triangle as to not get confused with lower mathematics / geometry) simply means a change in something. The actual term is "delta" and it is also known as the derivative of y as seen here: (delta) y / (delta) x. (delta) y / (delta) x would be read as the change in y with respect to x.
Delta - Its the fourth letter of the Greek alphabet, and it is often used in mathematical expressions to represent the change (i.e. the delta) that occurs to a value.