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Carbon dating would be one thing...
There is no such thing as a "d meaning".
The abbreviation PDE stands for partial differential equation. This is different from an ordinary differential equation in that it contains multivariable functions rather than single variables.
Differential calculus is a branch of math involved in finding instantaneous rates of change. A differential is one of those concepts, which, just like linear algebraic equations the slope may be separated into 2 parts, so a differential may be one part of an instantaneous rate of change.
The meaning of mathematics trivia is to help someone learn math. Many people quiz their students on multiplication for example.