In poetry _ is made up of stressed and unstressed syllables

In poetry, the combination of stressed and unstressed syllables is called "meter." Meter creates a rhythmic pattern in a poem and helps to establish its musical quality. There are different types of meters in poetry, but one common type is called "iambic meter." An "iamb" is a metrical foot consisting of two syllables, the first unstressed and the second stressed. This pattern is often compared to the rhythm of a heartbeat: da-DUM, da-DUM, da-DUM. When iambic meter is used consistently throughout a poem, it is called "iambic pentameter," meaning there are five iambs (or ten syllables) per line. Other types of meters include "trochaic meter," which is the opposite of iambic meter and consists of a stressed syllable followed by an unstressed syllable (DUM-da, DUM-da, DUM-da), "anapaestic meter," which consists of two unstressed syllables followed by a stressed syllable (da-da-DUM, da-da-DUM, da-da-DUM), and "dactylic meter," which consists of a stressed syllable followed by two unstressed syllables (DUM-da-da, DUM-da-da, DUM-da-da). In summary, the combination of stressed and unstressed syllables in poetry is called "meter," and one common type of meter is "iambic meter," which consists of two syllables, the first unstressed and the second stressed.