It varies, but a and g.
Traditionally, Hamburgefonts (despite no diagonals). See previous threads…
I wonder what automated WTF uses.

http://typophile.com/node/56884

Thanks very much everyone! Nick shinn I have another question and i hope im not bothering you to much with to many questions, but what are diagonals?

Diagonals are the letters that have slanted strokes, namely kvwxyz.

Which is why a popular alternative to Hamburgefonts is Handgloves.

Or Hamburgefontsiv

You could personalize it with your own selection of place name, eg, Orangeville (where I live). The "ill" is quite informative of text color.

Thanks guys i've really learned allot from this post !! Your help and attention is highly appreciated :)