Protection letters

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it’s A 18 letters crossword puzzle definition.
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Possible Answers:

SPF.

Last seen on: Wall Street Journal Crossword – March 24 2022 – Out to Launch

Random information on the term “SPF”:

Sunscreen, also known as sunblock or suntan lotion, is a photoprotective topical product for the skin that absorbs or reflects some of the sun’s ultraviolet (UV) radiation and thus helps protect against sunburn and most importantly prevent skin cancer. Sunscreens come as lotions, sprays, gels, foams (such as an expanded foam lotion or whipped lotion), sticks, powders and other topical products. Sunscreens are common supplements to clothing, particularly sunglasses, sunhats and special sun protective clothing, and other forms of photoprotection (e.g. umbrellas, etc.).

The first sunscreen in the world was invented in Australia, by chemist H.A. Milton Blake, in 1932 formulating with the UV filter ‘salol (Phenyl salicylate)’ at a concentration of ‘10%’ Its protection was verified by the University of Adelaide and it was also produced commercially by Blake’s company, Hamilton Laboratories. Despite sunscreen being relatively new, sun protection practices have been observed since at least the ancient Egyptians “who used ingredients such as rice bran, jasmine, and lupine” to provide sun protection.

SPF on Wikipedia