According to https://www.poets.org/poetsorg/text/haiku-poetic-form,

A traditional Japanese haiku is a three-line poem with seventeen syllables, written in a 5/7/5 syllable count. Often focusing on images from nature, haiku emphasizes simplicity, intensity, and directness of expression.

Haiku began in thirteenth-century Japan as the opening phrase of renga, an oral poem, generally 100 stanzas long, which was also composed syllabically. The much shorter haiku broke away from renga in the sixteenth-century..

I’ve written a haiku or two in my time, most recently in June of this year. Here’s my latest:

The wind is chilly

today and the sun hidden.

Must find my jacket.