packet

This term is defined in ECSS-E-ST-50-03C as
variable-length data structure consisting of higher layer user data encapsulated within standard header information

This term is defined in ECSS-E-ST-50-12C as
sequence of normal-characters comprising a destination address, packet cargo and an end of packet marker

This term is defined in ECSS-E-ST-50-51C as
SpaceWire packet