What is another word for "monogram"?

Roget's Thesaurus (1911) lists these synonyms for "monogram": abecedarian, abecedary, affix, alphabet, alphabetical, anagram, anagrammatism, arcanum, book, character, charade, christcross-row, cipher, concealed, confidential, consonant, conundrum, crack, crux, dead, dental, difficulty, digraph, diphthong, dissyllable, enigma, guttural, hieroglyphic, house, ideogram, ideograph, ignorance, incognita, intricacy, involved, labial, labyrinth, labyrinthian, labyrinthine, latency.