The acronym "CIV" is printed on the corner of tickets issued to show that they are covered under the terms of the contract—primarily providing compensation for lost baggage and a guarantee of onward transport, in the event of cancelled or missed connections.
The CIV missed connection protection only applies within a single contract for carriage, in other words, within one ticket.
The contract covers the passengers, along with any accompanying articles (hand luggage, registered baggage, vehicles and trailers) and live animals.
The conditions cover the rail journey itself, along with any intermediate inland waterway, international ferry or coach transport.
Passengers travelling via London to connect with an onward international train, or rail inclusive ferry journey (Rosslare, Dublin, Hook of Holland, or Eurostar to France/Belgium) are able to buy UK domestic segment tickets to the virtual destination London International (CIV), whose station code is LNE.