Phonology
A characteristic feature of Yucatec Mayan (and all Mayan languages) is the use of ejective consonants - /pʼ/, /tʼ/, /kʼ/. Often referred to as glottalized consonants, they are produced at the same place of oral articulation as their non-ejective stop counterparts - /p/, /t/, /k/. However, the release of the lingual closure is preceded by a raising of the closed glottis to increase the air pressure in the space between the glottis and the point of closure, resulting in a release with a characteristic popping sound. These sounds are written using an apostrophe after the letter to distinguish them from the plain consonants (e.g., t'àan "speech" vs. táan "forehead"). The apostrophes indicating these sounds were not common in written Maya until the 20th century but are now becoming more common. The Mayan b is also glottalized, an implosive /ɓ/, and is sometimes written b', though this is becoming less common.
Yucatec Maya is one of only three Mayan languages to have developed tone, the others being Uspantek and one dialect of Tzotzil. Yucatec distinguishes short vowels and long vowels - indicated by single versus double letters (ii ee aa oo uu) - and between high- and low-tone long vowels. High-tone vowels begin on a high pitch and fall in phrase-final position but rise elsewhere, sometimes without much vowel length; in either case this is indicated in writing by means of an acute accent (íi ée áa óo úu). Low-tone vowels begin on a low pitch and are sustained in length; they are sometimes but not always indicated in writing by means of a grave accent (ìi èe àa òo ùu). Also, Yucatec has contrastive laryngealization (creaky voice) on long vowels, sometimes realized by means of a full intervocalic glottal stop and written as a long vowel with an apostrophe in the middle, as in the plural suffix -o'ob'.
Read more about this topic: Yucatec Maya Language