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Substitute character

control character used in the place of a character that is recognized to be invalid or erroneous, or that cannot be represented on a given device; 0x1A in ASCII, U+001A in Unicode

Pronunciation
/ˈsʌbstɪtjuːt ˈkarəktə/
/ˈsəbstəˌtjut ˈkɛrəktər/