If you are meaning a Sans Serif that follows the same classic feel as Helvetica:

A more “square” Sans Serif could be Univers, but it is not exactly “squared”. It appears more “square” when compared to Futura or Helvetica. The “square” parts of it are the counters and the bowls, but still, like I said is only has the subtle nuance of “square-ness.”
Also, DIN might fall into this as well.

If you are looking for a square typeface might want to try:

Square Bold
Eurostile

These faces are as far as you can get before moving into perfectly geometric characters or “techno” fonts (I hate using that term as a classification):

Agency
Bank Gothic - small caps

http://youtube.com/watch?v=ohO_75earT8

That almost made me poop my pants. In a really good way.

António - I think what you’re looking for a class of sans serif called geometric sans. These are typefaces based on a perfect circle.

Futura
ITC Avant Garde Gothic

Hi all!
Thanks for the comments.
Stephen is rigth. I’m looking for a class of sans serif called geometric sans.
Other sugestions after Futura and ITC Avant Garde Gothic are welcome!

António

Kabel
ITC Kabel (almost completely different)

Sorry, I perceived as the other way around. I thought he wanted a more square feel. haha.

My bad.

I thought the logo in helvetica looked great...but I guess I’m just doomed to be addited. Oh well. but then again you can’t go wrong with futura.

Chase Langdon