With Nose the nose is called the tip of the surfboard.
The most common one sees the round nose on Malibus and the very pointed shortboard nose.
Another "nose shape" is Evolution Nose, which combines the features of the first two, as it is not as sharp as a shortboard nose, but not as wide as a Malibu nose.
Basically, one can say that a round nose helps the board to have better gliding properties into the wave. A pointed nose, on the other hand, serves for better maneuverability.
In addition, the penetration techniques work better with a more pointed nose, as it provides the attacking wave with less surface to the water.