The glottal stop or glottal plosive is a type of consonantal sound used in many spoken languages, produced by obstructing airflow in the vocal tract or, more precisely, the glottis. The symbol in the International Phonetic Alphabet that represents this sound is ⟨ʔ⟩.

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Glottal stop
ʔ
IPA Number	113
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Entity (decimal)	ʔ
Unicode (hex)	U+0294
X-SAMPA	?
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As a result of the obstruction of the airflow in the glottis, the glottal vibration either stops or becomes irregular with a low rate and sudden drop in intensity.^[1]

Features of the glottal stop:^{[citation needed]}

• Its manner of articulation is occlusive, which means it is produced by obstructing airflow in the vocal tract. Since the consonant is also oral, with no nasal outlet, the airflow is blocked entirely, and the consonant is a plosive.
• Its place of articulation is glottal, which means it is articulated at and by the vocal cords (vocal folds).
• It has no phonation at all, as there is no airflow through the glottis.^[2] It is voiceless, however, in the sense that it is produced without vibrations of the vocal cords.
• It is an oral consonant, which means air is allowed to escape through the mouth only.
• Because the sound is not produced with airflow over the tongue, the central–lateral dichotomy does not apply.
• The airstream mechanism is pulmonic, which means it is articulated by pushing air solely with the intercostal muscles and abdominal muscles, as in most sounds.

In the traditional romanization of many languages, such as Arabic, the glottal stop is transcribed with the apostrophe ⟨ʼ⟩ or the symbol ⟨ʾ⟩, which is the source of the IPA character ⟨ʔ⟩. In many Polynesian languages that use the Latin alphabet, however, the glottal stop is written with a rotated apostrophe, ⟨ʻ⟩ (called ʻokina in Hawaiian and Samoan), which is commonly used to transcribe the Arabic ayin as well (also ⟨ʽ⟩) and is the source of the IPA character for the voiced pharyngeal fricative ⟨ʕ⟩. In Malay the glottal stop is represented by the letter ⟨k⟩ (at the end of words), in Võro and Maltese by ⟨q⟩. Another way of writing the glottal stop is the saltillo ⟨Ꞌ ꞌ⟩, used in languages such as Tlapanec and Rapa Nui.

Other scripts also have letters used for representing the glottal stop, such as the Hebrew letter aleph ⟨א⟩ and the Cyrillic letter palochka ⟨Ӏ⟩, used in several Caucasian languages. The Arabic script uses hamza ⟨ء⟩, which can appear both as a diacritic and as an independent letter (though not part of the alphabet). In Tundra Nenets, it is represented by the letters apostrophe ⟨ʼ⟩ and double apostrophe ⟨ˮ⟩. In Japanese, glottal stops occur at the end of interjections of surprise or anger and are represented by the character ⟨っ⟩.

In the graphic representation of most Philippine languages, the glottal stop has no consistent symbolization. In most cases, however, a word that begins with a vowel-letter (e.g. Tagalog aso, "dog") is always pronounced with an unrepresented glottal stop before that vowel (as in Modern German and Hausa). Some orthographies use a hyphen instead of the reverse apostrophe if the glottal stop occurs in the middle of the word (e.g. Tagalog pag-ibig, "love"; or Visayan gabi-i, "night"). If it occurs in the end of a word, the last vowel can be written with a circumflex accent (known as the pakupyâ) if both a stress and a glottal stop occur in the final vowel (e.g. basâ, "wet") or a grave accent (known as the paiwà) if the glottal stop occurs at the final vowel, but the stress occurs at the penultimate syllable (e.g. batà, "child").^[3][4][5]

Some Canadian indigenous languages, especially some of the Salishan languages, have adopted the IPA letter ⟨ʔ⟩ into their orthographies. In some of them, it occurs as a casing pair, ⟨Ɂ⟩ and ⟨ɂ⟩.^[6] The digit ⟨7⟩ or a question mark is sometimes substituted for ⟨ʔ⟩, and is preferred in languages such as Squamish. SENĆOŦEN – whose alphabet is mostly unique from other Salish languages – contrastly uses the comma ⟨,⟩ to represent the glottal stop, though it is optional.

In 2015, two women in the Northwest Territories challenged the territorial government over its refusal to permit them to use the letter ⟨ʔ⟩ in their daughters' names: Sahaiʔa, a Chipewyan name, and Sakaeʔah, a Slavey name (the two names are actually cognates). The territory argued that territorial and federal identity documents were unable to accommodate the character. The women registered the names with hyphens instead of the ⟨ʔ⟩, while continuing to challenge the policy.^[7]

In the Crow language, the glottal stop is written as a question mark ⟨?⟩. The only instance of the glottal stop in Crow is as a question marker morpheme at the end of a sentence.^[8]

Use of the glottal stop is a distinct characteristic of the Southern Mainland Argyll dialects of Scottish Gaelic. In such a dialect, the standard Gaelic phrase Tha Gàidhlig agam ("I speak Gaelic"), would be rendered Tha Gàidhlig a'am.^{[citation needed]}

In many languages that do not allow a sequence of vowels, such as Persian, the glottal stop may be used epenthetically to prevent such a hiatus. There are intricate interactions between falling tone and the glottal stop in the histories of such languages as Danish (see stød), Cantonese and Thai.^{[citation needed]}

In many languages, the unstressed intervocalic allophone of the glottal stop is a creaky-voiced glottal approximant. It is known to be contrastive in only one language, Gimi, in which it is the voiced equivalent of the stop. ^{[citation needed]}

The table below demonstrates how widely the sound of glottal stop is found among the world's spoken languages:

• Saltillo
• Index of phonetics articles
• Voiced pharyngeal fricative