No audible release

In the International Phonetic Alphabet, lack of an audible release is denoted with an upper-right corner diacritic (U+031A ◌̚ COMBINING LEFT ANGLE ABOVE) after the consonant letter, as in: [p̚], [t̚], [k̚].

In most dialects of English, the first stop of a cluster has no audible release, as in apt [ˈæp̚t], doctor [ˈdɒk̚tə], or logged on [ˌlɒɡ̚dˈɒn].

In American English, a word-final stop is typically unreleased; that is especially the case for /t/,[5] but in that position, it is also analyzed as experiencing glottal reinforcement.

Some languages, such as Vietnamese,[citation needed] which are reported to have unreleased final stops, turn out to have short voiceless nasal releases instead.

[13]) In Gyalrongic languages, plosives and nasal stops could be unreleased after a glottal stop,[14] for example: In Pirahã, the only surviving dialect of the Mura language, there is a special register of speech using solely humming, which does not involve an audible release and may be transcribed as [m̚] of different length and tone.