From Wikipedia on "Percentage Point" > A percentage point or percent point is the unit for the arithmetic difference of two percentages. For example, moving up

From Wikipedia on "Percentage Point" > A percentage point or percent point is the unit for the arithmetic difference of two percentages. For example, moving up from 40 percent to 44 percent is an increase of 4 percentage points, but a 10-percent increase in the quantity being measured.[1] In literature, the unit is usually either written out,[2] or abbreviated as pp or p.p. to avoid ambiguity. After the first occurrence, some writers abbreviate by using just "point" or "points".