Glottal Consonant
Glottal consonants, also called laryngeal consonants, are consonants articulated with the glottis. Many phoneticians consider them, or at least the so-called fricative, to be transitional states of the glottis without a point of articulation as other consonants have; in fact, some do not consider them to be consonants at all. However, glottal consonants behave as typical consonants in many languages. For example, in Literary Arabic, most words are formed from a root C-C-C consisting of three consonants, which are inserted into templates such as /CaːCiC/ or /maCCuːC/. The glottal consonants /h/ and /ʔ/ can occupy any of the three root consonant slots, just like "normal" consonants such as /k/ or /n/.
Read more about Glottal Consonant: Glottal Consonant in IPA, Characteristics