physical quantityparallel in serial out
pipeline architectureparallel in serial out
SIPOserial in serial out
two way serial in parallel out and parallel in serial out transceiver
serial-in parallel-out multiplier
USB(Universal Serial Bus) serial-port
word-serial and bit-serial
serial input/serial output
an out and out reactionary political force
an out-and-out country life
casting-out-9 check=casting out nines
Out of sight and out of mind