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It has been reported that sunscreen with a sun protection factor (SPF) of 8 based on the UVB spectrum can decrease vitamin D synthetic capacity by 95 percent, whereas ...
en.wikipedia.org

What do the letters SPF stand for? Find out more about this common acronym - what it means and how it is measured.
dermatology.about.com

Sender Policy Framework (SPF) is an email validation system designed to prevent email spam by detecting email spoofing, a common vulnerability, by verifying sender IP ...
en.wikipedia.org

About SPF Welcome to the Sender Policy Framework project! Read an introduction to what SPF is, or about how SPF fits into the bigger picture of e-mail authentication.
www.openspf.org

Acronym Definition; SPF: Sun Protection Factor (sun block rating) SPF: Sender Policy Framework (antispam initiative) SPF: Strategic Prevention Framework (US federal ...
acronyms.thefreedictionary.com