Trochaic monometer
A trochaic foot (known as a trochee) has a long syllable followed by a short syllable (LS or /U).
Monometer is one foot per line.
Example
Rivers,
rangers,
climbers,
dangers.
Bears and
mountains,
pristine
fountains.
Anonymous – Yellowstone Park
A closer look at the feet in this poem
U = short syllable; / = long syllable