A two-letter combination or symbol in writing that represents a single sound or function, less commonly used than 'digraph'.
From 'di-' (two) + Greek 'gramma' (letter, writing). This term parallels 'digraph' but emphasizes the symbolic or diagrammatic aspect of letter pairs.
Before 'digraph' became standard, 'digram' was used interchangeably, showing how scientific terminology evolves—similar to how we once said 'wireless telegraph' before 'radio' won out.
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