“Haiku is a very short form of Japanese poetry. Traditional haiku often consist of 17 on (also known as morae though often loosely translated as "syllables"), in three phrases of 5, 7, and 5 on, respectively.“ says Wikipedia.
“The French alexandrine is a syllabic poetic meter of 12 syllables with a medial caesura dividing the line into two hemistichs (half-lines) of six syllables each.“ says Wikipedia.
