The form called an abecedarian is an ancient one, found in early religions texts and developed and experimented with in many languages. In English based abecedarians, notice how the letters a, b, c, and d form the pattern for the name of this term: abecedarian.
In a traditional acrostic-like abecedarian, the letters at the beginning of each line forms the pattern for this poetic form. Like all poetic forms, the restriction of the form is a way to create and inspire new connections and combinations as you write. See the resources below for more description of the form, or read abecedarians on this site.
Abecedarian on Poets.org: https://poets.org/glossary/abecedarian
This brief description may also be helpful:
https://www.poetryfoundation.org/learn/glossary-terms/abecedarian
