However, depending on its specific form, it could be called:
* A vertical poem - A simple and straightforward way to describe it.
* A concrete poem - If the words are arranged to create a visual image.
* A shape poem - If the poem is shaped like an object or symbol.
* A calligram - If the poem is written in a decorative or artistic style.
Ultimately, the best way to describe a vertical poem depends on the specific context and the poem's unique features.