Definition of "SPF"

SPF

noun
countable and uncountable, plural SPFs
1. Initialism of sun protection factor.
  Quotations
  Most dermatologists, as well as the American Academy of Dermatology, recommend an SPF of at least 30 for most people and most climates.
  2022 July 21, Nancy Redd, “How much SPF is enough?”, in The New York Times‎
2. Initialism of single point of failure.
3. Initialism of spray polyurethane foam.
4. Initialism of spruce-pine-fir, mixed softwood timber
adjective
not comparable
1. (of laboratory animals) Initialism of specific-pathogen-free.
proper noun
1. (Internet) Initialism of Sender Policy Framework.