Wikipedia:

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In the ASCII character set the grave accent is encoded as character 96, hex 60. Unicode also provides the grave accent as a combining character, encoded as 768, hex 300. Outside the U.S. character 96 is often replaced by the local currency symbol. Many older UK computers, such as the ZX Spectrum and BBC Micro, have the £ symbol as character 96.

On many computer keyboards, the grave accent occupies a key by itself, and is meant to be combined with vowels as a multi-key combination. However, programmers have used the key by itself for a number of tasks.

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Wikipedia:

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The typewriter apostrophe ( ' ) was inherited by computer keyboards, and is the only apostrophe character available in the (7-bit) ASCII character encoding, which is the original basis for the computer representation of the Latin alphabet.

As such, it is a highly overloaded character. In ASCII, it represents a right single quotation mark, left single quotation mark, apostrophe, vertical line or prime (punctuation marks), or an apostrophe modifier or acute accent (modifier letters). (The separate ASCII grave accent ( ` ), intended as a modifier and assigned its own key on many keyboards, has sometimes found a non-standard role as a single opening quote.)

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Quote:

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'I wonder how many miles I've fallen by this time?'
- Alice's Adventures in Wonderland

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Quote:

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'

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Quote:

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апостроф ` вижу иногда в инете там, где на письме и в печати обычно ставят запятообразный апостроф (как ' ).

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В ответ на:

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grave-accent != left single quote

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В ответ на:

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'

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В ответ на:

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` - гравис (диакритический знак в виде прямой черты над гласной буквой, левый конец которой выше правого, используется в разных значениях в разных письменных традициях, во французском в настоящее время служит в основном смыслоразличению, в английском отмечает произносимое е в окончании -ed)

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