lục bát

Etymology
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Noun

 * 1) a traditional Vietnamese poetry with alternating lines of 6 and 8 syllables, whereby the last syllable of a 6-syllable line rhymes with the 6th syllable of the very next 8-syllable line, and the last syllable of an 8-syllable line rhymes with the last syllable of the very next 6-syllable line; the rhyming also has to conform to the matching of  or  tones

Usage notes
Unlike most kinds of poems, those of this kind are usually printed or displayed centered-aligned for balance.