Chart of Wulff's phonetic transcription system from 1888. Many of the symbols would end up being used by the International phonetic alphabet (IPA), but others, such as Greek τ δ ν for dental [t̪ d̪ n̪] and π μ for [p̪ m̪], would not be. Script and rotated letters would be used by the IPA, but not bold or italic typeface. This system includes a level of phonetic detail in its letters that the IPA transcribes with diacritics.