Can you help me to find what is the police of "Billabong" Please? thanks.

Avant Garde Gothic  Suggérée par Tomás Silcher 

Based on Avant Garde.
The first "B" is modified, and the "A" is an alternate of this font (not present in all versions)

Thankssssssssssss

B could be the Neutra Text.

Or 'Thin Lines and Curves':

http://www.dafont.com/thin-lines-and-curves.font?text=B&psize=l

Nope

Why not?...

Because Thin Lines and Curves doesn't match. That's why. Superimpose it and you'll see.

PS Really think a design company that uses the AvantGarde for a logo will substitute the needed B with a crappy thing as Thin Lines and Curves?

A little better than Neutra Text, IMHO...

Do the same superimposition with Neutra text. It is half way between Light and Book. Easy modification.