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**What does the symbol "d" mean??**

I've seen the symbol "d" many times and in a physics lecture. For example: the professor would write: [tex] I = \frac {dq}{dt} [/tex] instead of: [tex] I = \frac {Q}{t}[/tex] I think I've also seen it in calculus equations such as derivatives and such. I'm only in Pre-calculus so I haven't not yet gone over anything related to calculus. But I'm interested in finding out what the "d" means in the formulas. Thanks.