
1) Alphabetic character 2) Letter 3) Letter of the alphabet 4) The rh in rhapsody 5) Two successive letters
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https://www.crosswordclues.com/clue/digraph

1) Letter
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https://www.crosswordclues.com/clue/digraph
[orthography] A digraph or digram (from the δίς dís, `double` and γράφω gráphō, `to write`) is a pair of characters used to write one phoneme (distinct sound) or a sequence of phonemes that does not correspond to the normal values of the two characters combined. The sound is often, but not necessarily, one which cannot be express...
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http://en.wikipedia.org/wiki/Digraph_(orthography)

Directed graph.
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http://glossary.computing.society.informs.org/index.php?page=D.html

two letters expressing a single sound
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http://phrontistery.info/d.html

• (n.) Two signs or characters combined to express a single articulated sound; as ea in head, or th in bath.
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http://thinkexist.com/dictionary/meaning/digraph/

A graph in which each edge has a direction associated with it.
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http://www.daviddarling.info/encyclopedia/D/digraph.html

Any use of two alphabetical letters to indicate a single phonetic sound. For instance, in phonograph
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http://www.encyclo.co.uk/local/22385
Di'graph noun [ Greek
di- =
di`s- twice + ... a writing, ... to write.] Two signs or characters combined to express a single articulated sound; as
ea in
head , or
th in
bath .
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http://www.encyclo.co.uk/webster/D/65

alternative representation for C++ representation characters that doesn't exist in every national character set, such as {, }, [, ], and #:
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http://www.stroustrup.com/glossary.html

[
n] - two successive letters (especially two letters used to represent a single sound: `sh` in `shoe`)
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http://www.webdictionary.co.uk/definition.php?query=digraph

digraphy, digraph A group of two letters expressing a simple sound of speech.
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http://www.wordinfo.info/words/index/info/view_unit/2724/21

two letters representing one phoneme: bath; train; ch/ur/ch.
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https://www.encyclo.co.uk/local/20815
digram noun two successive letters (especially two letters used to represent a single sound: `sh` in `shoe`)
Found on
https://www.encyclo.co.uk/local/20974

Combination of two letters that represents one simple sound, as in
ea in mead,
th in thin
Found on
https://www.encyclo.co.uk/local/21221

a pair of letters representing a single speech sound, as ea in meat or th in path.
Found on
https://www.infoplease.com/dictionary/digraph
No exact match found.