# Symbol for relative entropy

Could you help me with typesetting the following symbol (marked by red frame):

I searched over all possible manuals but was not able to find it. It looks like capital D, but actually it is not the same.

• Do you have a pdf source of this picture? Then we can at least identify the font. – mafp Mar 15 '13 at 23:19
• No, unfortunately I do not have a pdf. It is from the book "probabilistic graphical models" by Daphne Koller and Nir Friedman, page 42 – iensen Mar 15 '13 at 23:23
• Could $\mathbb{D}$ be a valid approximation? – JLDiaz Mar 15 '13 at 23:24
• For me \mathbb{D} gives a different symbol with a double frame. – iensen Mar 15 '13 at 23:29

\documentclass{article}
$I\mkern-8muD((p,1-p)$