Number-based poetry is a formal category in which numerical constraints—such as syllable counts, line totals, stanza groupings, or mathematical sequences—dictate the poem’s structure, often drawing from traditions like haiku (5-7-5), Fibonacci poetry (based on the Fibonacci sequence), or sestinas (with six stanzas of six lines each); these constraints serve as generative frameworks that challenge poets to balance mathematical precision with expressive depth, as seen in the Oulipo movement’s use of combinatorial techniques or in contemporary poets like Terrance Hayes, who reinvent formal rules to explore identity, memory, and linguistic play.

Number-based poetry uses numeric constraints (e.g., syllable count, stanza count) as structural principle. Related to procedural constraint and numerological verse. Try writing a poem with 3 stanzas of 7 lines—constraints often spark invention.