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A rounded d with a curled top, marking differentiation in one variable.
Also known as: Curly d, Rounded d, Backwards 6
∂ marks a partial derivative — the rate of change with respect to one variable while the others are held fixed. It is a distinct character from the letter d, and the distinction is the difference between a partial and a total derivative.
Is encoded as U+2202 PARTIAL DIFFERENTIAL in the Mathematical Operators block.
Contexts: Mathematics
Marks a derivative taken with respect to one variable while every other variable is held constant, as distinct from the total derivative written with a plain d.
Contexts: Mathematics
Is a distinct character rather than a stylistic variant of the letter d, and substituting one for the other changes the mathematical claim being made.
Contexts: Mathematics
A rounded bowl with a stroke rising from its right side and curling over to the left at the top, like a lower-case d whose ascender has been bent backwards.