The name for the basic unit used in scansion or measurement of verse-usually contains one accented syllable and two unaccented syllables?

The name for the basic unit used in scansion or measurement of verse, usually containing one accented syllable and two unaccented syllables, is a foot.

There are various types of feet in poetry, including:

* Iamb: Unstressed, Stressed (u /)

* Trochee: Stressed, Unstressed (/ u)

* Spondee: Stressed, Stressed (//)

* Dactyl: Stressed, Unstressed, Unstressed (/ uu)

* Anapest: Unstressed, Unstressed, Stressed (uu /)

The most common foot in English poetry is the iamb, as it naturally reflects the rhythm of spoken English.