RDF abbreviation.
Radio direction-finding, -finder; (as verb trans.) employ RDF against.

[TahlilGaran] English Dictionary ▲

RDF
Reality-Distortion Field (attribute shared by charismatic leaders, like Steve Jobs of Apple Computers where the term originated) 
Resource Description Framework (W3C)

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲