U+2146 • symbol
Double-Struck Italic Small D (d) is a stylized double-struck italic form of the Latin small letter d. It is used in mathematical and scientific notation to represent variables or differential operators.
The Symbol For Double-Struck Italic Small D (ⅆ) is a unicode character in the Basic Multilingual Plane Plane. It is found in the Letterlike Symbols block and was approved as part of Unicode Version 3.2 in 2002
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ⅆ Click to copy