one-to-zero
O-network
one-way
one-wire
one-zone
on-hook
onionskin
on-line
on-load
only
  on-off
on-path
onset
on-stage
on-state
on-wafer
opacimeter
opacity
opamp
opaque
opdar

    on-off telegraph system

    система однополюсного телеграфирования