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

(roofing) an insulated and ballasted roofing assembly in which the insulation and ballast are applied on top of the membrane (sometimes referred to as an "inverted roof assembly").

plural of sun protection factor

plural of protected membrane roof

(informal, derogatory) The Sonny Bono Copyright Term Extension Act.

(history) Synonym of Berlin Wall (from the perspective of East Germany).