The IPA currently does not specify how to represent prenasalization, preglottalization or preaspiration. We first review some current transcription practices, and phonetic and phonological literature bearing on the unitary status of prenasalized, preglottalized and preaspirated segments. We then propose that the IPA adopt superscript diacritics placed before a base symbol for these three phenomena. We also suggest how the current IPA Diacritics chart can be modified to allow these diacritics to be fit within the chart.

In the JIPA article 'Proposal for superscript diacritics for prenasalization, preglottalization and preaspiration', Figure 1 includes a typo. The diacritics for Advanced Tongue Root and Retracted Tongue Root were confused.