What type of metrical foot consist an unstressed syllable directly followed by a stressed syllable?

The metrical foot that consists of an unstressed syllable directly followed by a stressed syllable is called an iamb.

Here's a breakdown:

* Iamb: *unstressed* / *stressed*

* Example: beLOw

Other common metrical feet include:

* Trochee: *stressed* / *unstressed* (e.g., HOme)

* Spondee: *stressed* / *stressed* (e.g., NIGHT MARE)

* Anapest: *unstressed* / *unstressed* / *stressed* (e.g., compare )

* Dactyl: *stressed* / *unstressed* / *unstressed* (e.g., HAPpiLY)

Let me know if you'd like to learn more about different metrical feet!