In it he described the first known digraphic substitution cipher.

Payne asserts: "With the exception of digraphic seals, the two scripts were never used together."

A few manuscripts from the same period use digraphic notation in which note names are included below the neumes.

English digraphic and digraphia were contemporaneous with their corresponding terms in French linguistics.

These digraphic reformers call for a generalized used of Pinyin orthography along with Chinese characters.

The support for this interpretation lies in some early digraphic manuscripts which combine chironomic neumes with letter-names.

Inuktitut is also officially digraphic, using both Latin and Inuktitut syllabics.

The Oxford English Dictionary, which does not yet include digraphia, enters two digraph terms and digraphic.

Yat-Shing Cheung differentiates three Chinese digraphic situations.

'Digraphic orthography."'

The earliest practical digraphic cipher (pairwise substitution), was the so-called Playfair cipher, invented by Sir Charles Wheatstone in 1854.

The OED2 defines two digraphic meanings, "Pertaining to or of the nature of a digraph" and "Written in two different characters or alphabets."

In it he described the first known digraphic substitution cipherDavid Kahn, 'The Codebreakers', 1967, p. 139, and foreshadowed the concept of polyalphabetic substitution.

Isaac Hollister Hall, an American scholar of Oriental studies, described an Eteocypriot language publication as "bilingual (or digraphic, as both inscriptions are in the same language)."

Hall's article was antedated by Demetrios Pieridis's 1875 usage of digraphic instead of bilingual for an inscription written in both the Greek alphabet and Cypriot syllabary.

Several other practical polygraphics were introduced in 1901 by Felix Delastelle, including the bifid and four-square ciphers (both digraphic) and the trifid cipher (probably the first practical trigraphic).

There, the teams find a digraphic substitution cipher, and using the six symbols they learnt from around the world, they crack the code as "THE PLACENTIA", the courtyard outside.

A digraphic substitution is then simulated by taking pairs of letters as two corners of a rectangle, and using the other two corners as the ciphertext (see the Playfair cipher main article for a diagram).

Digraphic notation, using letter names similar to modern note names in conjunction with the neumes, made a brief appearance in a few manuscripts, but a number of manuscripts used one or more horizontal lines to indicate particular pitches.

U A E O L W R I N S In this way, each ciphertext character depends on two plaintext characters, so the bifid is a digraphic cipher, like the Playfair cipher.

William C. Hannas distinguishes two digraphic forms of Japanese: "true digraphia" of occasionally using rōmaji Latin alphabet for a few loanwords like DVD, and of regularly using three scripts (technically, "trigraphia") for different functions.