I see that I made something a little confusing. I did not say it properly.

Can see italicized forms sometimes in Russian wikipedia. In math we call the ital. little d, curly d.

http://upload.wikimedia.org/wikipedi...nonitalics.png

The Greek little delta is sometimes used, but is a headache, because of similarities shown below.

http://upload.wikimedia.org/wikipedi..._Cyrillics.png

Delta here:

http://upload.wikimedia.org/wikipedi..._uc_lc.svg.png