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C accepts aliases for certain characters. Apparently in the 1990s some computer systems had trouble inputting these characters, or trouble displaying them. These digraphs almost never appear in C programs nowadays, but we mention them for completeness.
An alias for ‘[’.
An alias for ‘]’.
An alias for ‘{’.
An alias for ‘}’.
An alias for ‘#’, used for preprocessing directives (see Directives) and macros (see Macros).