International auxiliary language orthography

International auxiliary language orthography (IAL orthography) is often simplified when compared with natural language orthography.

Script

Most IALs use Latin script for their standard writing. Lingua Franca Nova is additionally defined in Cyrillic script.

Letter inventory

Most IAL writing systems use only letters from the ISO basic Latin alphabet. Some exceptions are:

Digraphs

Although most IALs eschew diagraphs, there are some IALs that use digraphs:

  • Interlingua: ch, qu, ph, sh
  • Ido: ch, qu, sh
  • Esperanto
    • H-system: ch, gh, hh, jh, sh
    • X-system: cx, gx, hx, jx, sx, ux

Collation

The basic ordering of the letters is as in the ISO basic Latin alphabet.

Esperanto sorts each letter with diacritic mark directly after the corresponding letter without such a mark. Uropi sorts the non-ASCII ʒ after all ASCII letters, i.e. after z.

References
  1. Pirro, Jean (1813-1886). Auteur du texte (4 September 1868). "Essai d'une langue universelle, par MM. Pirro et L. A." Gallica.
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