Open

O or OPEN may refer to:

• Open (film), a 2011 film
• Open (sport), type of competition in tennis, golf and other sports where entry is open to qualifiers regardless of amateur or professional status
• Open...., the original interactive television service on BSkyBs Sky Digital platform
• Online Protection and Enforcement of Digital Trade Act, a bill in the United States Congress to combat online piracy
• Organization of Pakistani Entrepreneurs of North America, inclusive, not-for-profit organization
• The One-Pair Ethernet specification of the OPEN Alliance SIG
• OPEN Cycle, bicycle manufacturer
• The German name of Opin in Poland

https://en.wikipedia.org/wiki/Open