Abecedarian writing is a twenty-six-line poem, list essay or story written so that the first word of each line follows in alphabetical order.
Start your first line with the letter A, the second with the letter B. Then continue until you end with a line starting with the letter Z. The restriction on starting words helps you think differently and be more focused on word choice.
For a variation on this style, take your name or a favorite stanza and choose words with those letters as the first words of the lines of your writing.
There’s not much to be found about this style of writing. Poets & Writers gives a short description. FamilyFriends Poems offers some sample poems and a template.
Here’s a sample story. Childhood Crush Ends