Adobe Photoshop CC 2014 v.14.xx User Manual
Page 125

Note:
PostScript (72 points per inch)
Traditional
2. For Rulers, choose a unit of measurement.
Changing the units on the Info panel automatically changes the units on the rulers.
3. For Point/Pica Size, choose from the following options:
Sets a unit size compatible for printing to a PostScript device.
Uses 72.27 points per inch, as traditionally used in printing.
4. Click OK.
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