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m Reverted edits by 192.68.163.170 (talk) (HG) (3.4.12)
 
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* [[Object Push Profile]], a Bluetooth communications protocol based on the OBEX protocol
* [[Octonionic projective plane]], or Cayley plane, a projective plane over the [[octonions]]
* Oriented Polypropylenepolypropylene, and specifically [[BOPP]] (biaxially oriented PP), a polymer used mainly for packaging and labeling
* [[Ortho-phenylphenol]], or 2-Phenylphenolphenylphenol, an organic compound used as a fungicide
* [[Ovine progressive pneumonia]], or ovine lentivirus, a chronic infection of Visna virus that affects sheep
* [[Yamaha YM2164]], an FM synthesis sound chip also called FM Operator Type P (OPP)