Many sounds found only in disordered speech are indicated with diacritics, though an increasing number of dedicated letters are used as well. Special letters are included to transcribe the speech of people with lisps and cleft palates. The extIPA repeats several standard-IPA diacritics that are unfamiliar to most people but transcribe features that are common in disordered speech. These include preaspiration , linguolabial , laminal fricatives and for a sound (segment or feature) with no available symbol (letter or diacritic). The novel transcription is used for an English molar-r, as opposed to for an apical r; these articulations are indistinguishable in sound and so are rarely identified in non-disordered speech.