Actually, it is a triangle when you PRINT it by hand, but if you write it CURSIVELY, it looks more like a "D" when in uppercase, and a "g" in lowercase.

Here is a link with cursive examples
http://masterrussian.com/blalphabet.shtml

I did a Google search but I could not find how to PRINT the letters by hand. I guess people do not write in print anymore.