spf

Initialism of sun protection factor. [An indication of how long a sunscreen remains effective when applied to the skin.]

Initialism of single point of failure. [A component in a device, or a point in a network, that, if it were to fail, would cause the entire device or network to fail (normally eliminated by adding redundancy).]

(Internet) Initialism of Sender Policy Framework.

Initialism of spray polyurethane foam.

Initialism of spruce-pine-fir, mixed softwood timber.

Initialism of Scottish Police Federation.

(of laboratory animals) Initialism of specific-pathogen-free.