De acordo com documento da ICAO Anexo 11 - Serviços de Tráfego Aéreo ; Apêndice 2:
2. Designators for significant points marked by the site of
a radio navigation aid
(...)
2.1.2 In selecting a name for the significant point, care shall be taken to ensure that the following conditions are met:
a) the name shall not create difficulties in pronunciation for pilots or ATS personnel when speaking in the language used in ATS communications. Where the name of a geographical location in the national language selected for designating a significant point gives rise to difficulties in pronunciation, an abbreviated or contracted version of this name, which retains as much of its geographical significance as possible, shall be selected;
Example: FUERSTENFELDBRUCK = FURSTY
b) the name shall be easily recognizable in voice communications and shall be free of ambiguity with those of other significant points in the same general area. In addition, the name shall not create confusion with respect to other communications exchanged between air traffic services and pilots;
(...)
3 Designators for significant points not marked by the site of
a radio navigation aid
3.1 Where a significant point is required at a position not marked by the site of a radio navigation aid, the significant point shall be designated by a unique five-letter pronounceable “name-code”. This name-code designator then serves as the name as well as the coded designator of the significant point.
3.2 This name-code designator shall be selected so as to avoid any difficulties in pronunciation by pilots or ATS personnel when speaking in the language used in ATS communications.
Examples: ADOLA, KODAP
3.3 The name-code designator shall be easily recognizable in voice communications and shall be free of ambiguity with those used for other significant points in the same general area.
3.4 The name-code designator assigned to a significant point shall not be assigned to any other significant point.