Acrostick

[L]et him that is melancholy [...] apply his minde I ſay to Heraldry, Antiquity, invent Impreſſes, Emblemes; make Epithalamiums, Epitaphs, Elegies, Epigrams, Palindrona Epigrammata, Anagrams, Chronograms, Acroſticks, upon his friends names; [...]

Source: wiktionary

And afterwards gives as many reaſons for it, as there are letters in Hibernaculum Ciconiarum, and that too in the Acrostick way, each ſentence beginning with a letter of thoſe words, according to their order.

Source: wiktionary

But ſhould this Method fail, recourſe might be had to others more effectual, by Learned Men called Acroſticks and Anagrams. Firſt, might be found Men of Skill and Penetration who can diſcern that all initial Letters have political Meanings.

Source: wiktionary

The Whole [of the Book of Zephaniah] is wrote in a very lively, tender, and pathetic Stile; and all the Chapters, except the laſt, (which ſeems to have been of later Compoſition than the reſt) are in Acroſtick Verſe, i.e. every Line, or Couplet, begins, in an Alphabetical Order, with ſome Letter in the Hebrew Alphabet.

Source: wiktionary