open - over
- open
- open antenna
- open boat
- open circuit
- open contact
- open core
- open cycle
- open failure
- open loop
- open magnetic circuit
- open plasma trap
- open plug
- open region
- open relay
- open resonator
- open subroutine
- open waveguide
- open wire
- open wiring
- open-center display
- open-center plan-position indicator
- open-circuit
- open-circuit admittance
- open-circuit characteristic
- open-circuit current
- open-circuit forward-transfer impedance
- open-circuit immitance
- open-circuit impedance
- open-circuit input impedance
- open-circuit jack
- open-circuit output admittance
- open-circuit output impedance
- open-circuit parameters
- open-circuit photovoltage
- open-circuit reverse-transfer impedance
- open-circuit reverse-voltage transfer ratio
- open-circuit signaling
- open-circuit stable negative resistance
- open-circuit termination
- open-circuit transadmittance
