What is tresillo?

Tresillo

Tresillo (capital: Ꜫ, small: ꜫ; Spanish for "little three") is a letter of the Latin alphabet, based on the digit 3. It was invented by a Franciscan friar, Alonso de la Parra, in the 16th century to represent the uvular ejective consonant /qʼ/ found in Mayan languages, and is known as one of the Parra letters. In cursive form, the tresillo is often written c ̑.

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Some articles on tresillo:

Afro-Cuban Jazz - History - "Spanish Tinge"—the Cuban Influence in Early Jazz
... or tango.) can be thought of as a combination of tresillo and the backbeat ... Early New Orleans jazz bands had habaneras in their repertoire and the tresillo/habanera figure was a rhythmic staple of jazz at the turn of the 20th century ... the music of Cuba, Wynton Marsalis observes that tresillo is the New Orleans "clave" ...
Clave (rhythm) - Types - Son Clave - Tresillo
... the first three strokes of son clave are also known collectively as tresillo, a Spanish word meaning triplet i.e ...
Contradanza - Cinquillo, Tresillo, and The Habanera Rhythm
... The cinquillo (a variant of the more basic tresillo) is a syncopated rhythmic cell whose introduction into the contradanza/danza began its differentiation from a strictly European form ... of the 19th century, composers in western Cuba remained ignorant of its existence Tresillo is used for ostinato bass figures of some contradanzas, such as "Tu madre es conga." Another tresillo variant popularized by ...
Music Of New Orleans - Jazz - Cuban Influence
... as congo, tango-congo, or tango.) can be thought of as a combination of tresillo and the backbeat ... Gottschalk used the tresillo variant cinquillo extensively ... Whether tresillo was directly transplanted from Cuba, or if the habanera merely reinforced tresillo-like "rhythmic tendencies" already present in New Orleans music is probably impossible ...