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(1) (Points Per Inch, Pulses Per Inch) The measurement of mouse movement.

(2) (PPI) (Perceptive Pixel Inc.) See PixelSense.

(3) (Pixels Per Inch) The measurement of the resolution of a monitor or scanner. Earlier CRT screens measured around 96 ppi, while LCD screens on laptop and desktop computers today range from about 100 to 140 ppi. In order to display more information, tiny smartphone screens require higher resolution. For example, in 2007, Apple introduced the iPhone with 160 ppi. Three years later, the iPhone 4's Retina Display screen was 326 ppi. The HTC One smartphone came out in 2013 at 468 ppi.

Pixels and Dots
Pixels per inch (ppi) are the number of full pixels per inch on a screen, and each pixel on a color display comprises three or more subpixels, with some exceptions (see PenTile). Dots per inch (dpi) rates printer resolution, and the dots refer to the smallest element that is printed (see dpi).

How Pixels and Dots Relate
A digital image is measured in pixels. For example, a 600x300 pixel image has 600 horizontal pixels and 300 vertical. The way the image appears on screen and paper is determined by the ppi and dpi. On a 100 ppi screen, the image would be 6" by 3". Printed at 300 dpi, the standard for quality printing, the paper image would be 2" by 1". An 8x10" high-quality print would therefore require an image with a minimum resolution of 2400x3000 pixels. To view it end to end on screen, it has to be scaled smaller, because most monitors are not large enough. See dot pitch and RGB.

iPhone Pixels
High pixel density is why it is easy to read text on smartphones such as these. (Image courtesy of Apple Inc.)
References in periodicals archive ?
Producer Price Index on Non-domestic Market in March 2019 increased by 1.8% compared to the previous month.
The producer price index for the non-oil products witnessed stability during the period from the first to the third quarter of 2007.
* Lines 7-16, producer price index, www.bls.gov/ PPI or telephone the Bureau of Labor Statistics, Producer Price Index (202) 691-7705.
In June, compared with the previous month, the producer price index grew by 0.8%.
Producer Price Index for locally consumed products (December 2015=100) reached 98.99 in December 2017, which indicates a decrease by 0.47% compared to November 2017.
Qatar's General Producer Price Index (PPI) increased 2.5% in May compared to the month before, the Ministry of Development Planning and Statistics (MDPS) has said.
The producer price index, a key gauge of inflation at the wholesale level, fell 3.3 percent in December from the year before, following the 2.7-percent drop in November.
The overall Producer Price Index (PPI) for Palestine with its base year (2011=100) reached 102.43 in March 2014, as it decreased by 1.54% compared to February 2014.
According to the Turkish Statistical Institute's report, Producer Price Index (PPI) was down by 0.51 percent (month on month) in April 2013.
19 September 2011 - Finland's producer price index (PPI) for manufactured goods rose by 5.5% year-on-year in August 2011, mainly due to increased prices of oil products and chemicals, as well as iron and steel, Statistics Finland said today.
In February 2011, compared with January 2011, the industrial producer price index rose by 0.8% in both the eurozone (EA17) and the EU27.
The producer price index includes two types of products, the first of which is oil and gas products which includes crude oil and gas product, refined oil products, LNG.