#vertical reading
- Acrostic — A poem, hymn, or lyrical composition in which the initial letters of each line, when read vertically from top to bottom, form a specific word, a sentence, a hidden dedication, or a person's name (often the author's own). This structural device and literary technique was extensively used in ancient Alexandrian poetry, Byzantine religious hymnography, and medieval texts, serving both an aesthetic mnemonic role and a cryptographic function to authenticate the original work.