Dot pitch
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The distance between two pixels is typically measured in terms of pixels or in units like millimeters or inches on a display screen or printout. It indicates the separation between the centers of the two pixels.
Cellpadding adds space all around a table cell - so if you set cellpadding to 2 pixels, you're adding 4 pixels between the data in neighboring cells. But cellspacing controls the space between the cells, so specifying 2 will add just two pixels between the cells.
pixels
detecting the smile in the picture by making the picture into a clarity picture. i.e. by boosting of pixels(decreasing the space between pixels of an image)
The space between your toes is called the interdigital space.
The question doesn't make any sense. If you want to know what the distance between pixels is called, it is dot pitch. If you are asking what the actual distance is, that depends on the monitor. The manufacturer would have this information.
The space between neurons is called the synapse.
The space between your eyebrows is called the "Glabella."
It is the space between the cell border and the text or images inside the cell. The number provided is the space in pixels. In modern HTML, it is set using CSS declarations.
Usually the more pixels you have, the clearer or higher the resolution you have.
dot pitch