WORD OF THE DAY
One unit of a writing system is called a grapheme. In English, the letter t is a grapheme, and so is the letter combination ch.
The key to understanding graphemes is knowing that they represent specific individual sounds in a language. Often, a grapheme is simply a letter, but it can also be a pair of letters like oo or th, or longer chains like igh or ough. The sounds you say out loud when you pronounce these graphemes are known as phonemes. The word grapheme was coined in 1937 by a linguistics professor, from graph, "letter."
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