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ITU-T E.121 (07/1996)

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Pictograms, symbols and icons to assist users of the telephone service
The purpose of this Recommendation is to identify pictograms, symbols and icons that could be used to aid users in the identification of services available and then in the use of such services. The revisions to this Recommendation include new symbols and pictograms, developed in close collaboration with the International Electrotechnical Commission (IEC).
Citation: https://handle.itu.int/11.1002/1000/3415
Series title: E series: Overall network operation, telephone service, service operation and human factors
  E.100-E.229: International operation
  E.120-E.139: General provisions concerning users
Approval date: 1996-07-19
Approval process:TAP
Status: Superseded
Maintenance responsibility: ITU-T Study Group 21
Further details: Patent statement(s)