acrostic
writing in which the first letter, syllable or word of each line, paragraph or other recurring feature in the text spells out a word or a message
en-GB/əˈkɹɒstɪk/
en-US/əˈkɹɑstɪk/
writing in which the first letter, syllable or word of each line, paragraph or other recurring feature in the text spells out a word or a message