Verizon Online - Personalize Your E-Mail Address Today! - [ Traduire cette page ]
... From our home page at start.verizon.net, select the My Account navigation ball.
Within My Account, select E-Mail Alias Manager. You will first be asked to ...
dsl.gte.net/announcements/alias.asp

Morgan Adams Immersive Media - [ Traduire cette page ]
... the Fuji trade show exhibit in QuickTime VR, or by turning the 3D navigation ball
to reveal the desired topic title. The Virtual Tour is zoomable to show ...
www.morganadams.com/fuji.html

Amazon.co.uk: At a glance: The Human Body - Your Body -
... but on greater acquaintance hugely absorbing. Using the special Life Stages 'navigation
ball' the viewer can scroll through six stages of human existence, from ...
www.amazon.co.uk/exec/obidos/ASIN/B00004U23Z/ref=ed_felist_...

Electic Tech - Microsoft Trackball Explorer - Page 2
... The location of the navigation ball is also something to note with these two models.
On the Explorer, the navigation ball is located on the top of the device ...
www.maxreboot.com/reviews/MS_Explorer_Optical/index1.shtml

Untitled Document
... books to computer screens might find this device frustrating, particularly as the
navigation ball likes to position itself in the centre of the text with each ...
www.cs.uwa.edu.au/~fontor/writing/planetofnoise.html

HALion - The VST Sampler! - [ Traduire cette page ]
... and dropped and have velocity layers set up in a breeze. Use the navigation ball
to get around fast. WaveLoop Page Setting loop points in the waveloop editor ...
www.digitalprosound.com/2001/10_oct/news/steinberg_halion.h...

In one word.

“trackball” glossary on google gets you 2 750 hits. Plenty of reliable sources to confirm, one of which is set out below. "Navigation ball" exists of course, but in terms of most common usage, in context, I would go for "trackball".

http://webopedia.lycos.com/TERM/T/trackball.html

Trackball. A pointing device. Essentially, a trackball is a mouse lying on its back. To move the pointer, you rotate the ball with your thumb, your fingers, or the palm of your hand. There are usually one to three buttons next to the ball, which you use just like mouse buttons.
The advantage of trackballs over mice is that the trackball is stationary so it does not require much space to use it. In addition, you can place a trackball on any type of surface, including your lap. For both these reasons, trackballs are popular pointing devices for portable computers.