Sorry for my English but... I'm looking for naturally justified fonts (same space whatever the sign is)
Does it exist?

Perhaps here: http://www.dafont.com/theme.php?cat=503

Yes, it exist. I's named Fixed Width.
If you have windows, the "Courier New" is one of that.
You can find many other here : http://www.dafont.com/theme.php?cat=503&fpp=50

The actual term is monospaced

A monospaced font, also called a fixed-pitch or non-proportional font


http://www.codestyle.org/css/font-family/sampler-Monospace.shtml

Yep. Yet, remember lead?

It's usualy a pre downloaded font, called "Arial"

There is a difference between Arial and Arial Monospaced

http://www.fonts.com/findfonts/detail.htm?productid=145818

very useful & quick answers! thanks.

gilles