Bell system reference system

boiling-reflux-open-system

buffer open system

cell open system

circulation of open system

completely open system

continual open system

disequilibrium open system

Distributed Intelligent Open System

Earthquake open system

emergency open system

Government Open system Interconnection Profile

hydraulic system: open center

INFI-90 open system

Internet open trading protocol

IOTP Internet Open Trading Protocol

IP multiMedia open system

Open mode

open mode experiment