Wouldn't "character () of ()" be a more accurate name for that block?
Letter 3 of "567 test" is "s", whereas character 3 of "567 test" would be "7".
To people who don't have any experience with programming, "character" means, well, a character in a story. "Letter" makes the block much more accessible to new users. Through use and discussion of the block, they'll probably learn that "character" is a more accurate word to refer to an individual glyph in a string; we don't need to make that block require that knowledge to make sense.
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To people who don't have any experience with programming, "character" means, well, a character in a story. "Letter" makes the block much more accessible to new users. Through use and discussion of the block, they'll probably learn that "character" is a more accurate word to refer to an individual glyph in a string; we don't need to make that block require that knowledge to make sense.