Sun Protection Factor Definition

noun
A number indicating the relative effectiveness of a sunblock in preventing certain ultraviolet rays from burning the skin: a higher number indicates a greater degree of protection.
Webster's New World

An indication of how long a sunscreen remains effective when applied to the skin.

If someone normally burns in 10 minutes with no sunscreen, then a sunscreen with sun protection factor 20 will provide protection for up to 20x10 = 200 minutes.
Wiktionary
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Other Word Forms of Sun Protection Factor

Noun

Singular:
sun protection factor
Plural:
sun protection factors

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