- Open Set (mathematics)
- Open Problem in science and mathematics, a well-defined problem with no known solution
- Open (sport) - A type of competition in tennis and golf (among others) where entry is open to all qualifiers regardless of age
- Open System s
- --- In science, where an Open System (system Theory) means a system in which matter or energy can flow into and/or out of the system, in contrast to a closed system in which no energy or matter may enter or leave the system
- --- In computing, where an Open System (computing) is a computer operating system that provides interoperability, portability or both, particularly Unix systems
- Open Vowel s in Phonetics
- Open... was the original interactive television service on BSkyBs Sky Digital platform
|
