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Reference
Preferences
Formatting Options
...Display Options
NumberMarks
• NumberMarks is an option for cells that determines if ` marks should be included in the printed forms of approximate numbers.
• Number marks are used to indicate the type of numbers and their precision or accuracy.
• With the setting NumberMarks 
True, a number with `, ``, or *^ is shown with those characters. This is the default for input styles.
• With the setting NumberMarks False, a number is rounded to the precision or accuracy given and scientific notation is used, if appropriate.
• The *^ form for scientific notation is always used in InputForm and is independent of NumberMarks.
• See also: PrintPrecision.
