APP explained

App is short for Application.

It could be an abbreviation for:

• Appalachian State University
• Appalachian Mountains

APP could mean:

• Adjusted Peak Performance, a metric to measure computing performance in 64-bit processors and above
• Amyloid precursor protein, a protein fragment associated with some neurological disorders
• Associated Press of Pakistan
• The Alan Parsons Project, a progressive rock band
• Application software, a type of computer program
• Atom Publishing Protocol, a protocol for creating and updating web resources
• Asia Pulp & Paper
• Alberta Provincial Police
• .APP (filename), filename extension. Application for Symbian OS
• Asia-Pacific Partnership

In political parties

• Anticlerical Progress Party REASON, a Polish political party
• Austrian People's Party, an Austrian political party
• Populist Party (United States), an American political party
• American People's Party, an American political party
• Alliance populaire progressiste, a Mauritanian political party

In railway codes

• Appleton, Wisconsin, in Amtrak's three-letter code
• Appleby railway station, England, in National Rail's code