PDF is most commonly used to refer to a type of Portable Document Format in computing. Portable Document Format (PDF), sometimes mistaken for Printable Document Format, is an open file format created by Adobe Systems in 1993 and is now being prepared for submission as an ISO standard. ...

Other uses include the following.

In education:

• Post-doctoral fellowship

In fiction: A postdoctoral appointment (colloquially, a post-doc) is a temporary research position held by a person who has completed his or her doctoral studies. ...

• Planetary Defence Force in the Warhammer 40,000 universe

In the military: It has been suggested that this article or section be merged into Imperium (Warhammer 40,000). ... This article is about the tabletop miniature wargame and the fictional universe in which it is set. ...

• Panama Defense Forces
• Permanent Defense Forces (Ireland)

In science: Panama is one of two countries in Latin America (the other being Costa Rica) that have permanently abolished standing military forces. ... Troops from the Ranger wing, the Irish armys Special forces The Irish Army (Irish: Arm na hÉireann) is the main branch of the Irish Defence Forces (Óglaigh na hÉireann). ...

• Atomic pair distribution function
• Parkinson's Disease Foundation [1]
• Parton Distribution Function
• Planar deformation features
• Powder Diffraction File
• Probability density function
• Probability distribution function
• Polypeptide Deformylase

In software: The atomic pair distribution function (PDF) describes the density of interatomic distances in a material. ... In particle physics, the parton was a hypothetical fundamental particle considered, in the parton model of strong interactions, to be a constituent of the hadron. ... Planar deformation features, or PDFs, are optically recognizable microscopic features in grains of silicate minerals (usually quartz or feldspar), consisting of very narrow planes of glassy material arranged in parallel sets that have distinct orientations with respect to the grains crystal structure. ... The International Centre for Diffraction Data (ICDD) maintains a database of powder diffraction patterns, the Powder Diffraction File (PDF), including the d-spacings (related to angle of diffraction) and relative intensities of observable diffraction peaks. ... In mathematics, a probability density function (pdf) serves to represent a probability distribution in terms of integrals. ... In mathematics, a probability distribution assigns to every interval of the real numbers a probability, so that the probability axioms are satisfied. ... A protein primary structure is a chain of amino acids. ...

• Package Definition File (Microsoft Systems Management Server)

Additional uses: Microsoft Systems Management Server (SMS) is a systems management software product by Microsoft for managing large groups of Windows-based computer systems. ...

• KPDF-CA
• PDF417, a 2D barcode
• PDF Solutions
• Playa del Fuego, a mid-atlantic art festival inspired by Burning Man
• An acronym for Pretty Damned Funny

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