* Haiku: A traditional Japanese form with 17 syllables total, divided into 5-7-5.
* Tanka: Another Japanese form with 31 syllables, divided into 5-7-5-7-7.
* Cinquain: An English form with 22 syllables, divided into 2-4-6-8-2 syllables per line.
Other possibilities:
* Limerick: A humorous, five-line poem with a specific rhyme scheme (AABBA). While not strictly limited by syllable count, limericks are generally short.
* Free Verse: Though not subject to strict syllable rules, free verse poems can still be short and concise.
Let me know if you have a specific poem in mind, and I can help you identify the form!