This European Standard provides a system for the identification and presentation of information about the ILU. The identification system is intended for general application, for example in documentation, control and communications (including automatic data processing systems), as well as for display on an ILU and other non ISO containers (i.e. which dimensions and testing parameters differ from those defined by the applicable ISO standards) used in European transport. The methods of displaying identification and certain other data (including operational data) on ILUs by means of permanent marks are included. This European Standard specifies: a) an ILU identification system with an associated system for verifying the accuracy of its use, having mandatory marks for the presentation of the identification system for visual interpretation; b) a coding system for data on ILU size and type, with corresponding marks for their display; c) mandatory operational marks; d) physical presentation of the marks on the ILU. This part of EN 13044 specifies a system to identify the owner of the ILU, which includes an associated system for verifying the accuracy of its use. This European Standard does not cover temporary operational marks of any kind, permanent marks, data plates, etc. which may be required by intergovernmental agreements, national legislation or non-governmental organisations other than CEN.