"Verse", the individual line format of poems, is used most often in poetry. In fact, if the work is not in verse format, it isn't even poetry. One problem with this answer though is that it is a tautology. It is like saying "poetry is used most often in poetry." Not very helpful. So another answer could be "meter." Meter is the rhythmic inflection of stressed and unstressed syllables of the words in each line of verse. Not all poetry has meter though. Some poems have lines written without a specific metric format. This is called "free verse." Note that even lines of a poem that have no meter are still called "verse." "Rhyme schemes" are a distant third. Poems need not rhyme to be considered poetry.
Conceit is a literary technique that involves the use of a very complex metaphor. It is most often used in poetry.
The most famous type of poetry found in Romeo and Juliet is a sonnet. ( a love poem)
E.E. Cummings is most famous for his unique style of poetry that often experiments with grammar, punctuation, and syntax. He is known for his use of lowercase letters, unusual word placement, and playful language in his poetry.
Poetry is often called the language of love.
Repetition is most often used for emphasis.
Metaphysical
Most poetry is worded in the abstract, but an abstract of poetry is a physical thing.
Metaphysical
The Sun Is Often Out - poetry - was created in 2010.
The Sun Is Often Out - poetry - has 208 pages.
The closest I could find was the definition of "Cyber poetry man," which is: A man who uses cyber poetry to fight crime and/or communists. Cyber Poetry Men often use useless disguises. Many were exterminated in the holocaust.
Use of lowercase.