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Char

A Char represents a 32-bit Unicode code point.

It is typically created with a char literal by enclosing an UTF-8 character in single quotes.

'a'
'z'
'0'
'_'
'あ'

A backslash denotes a special character, which can either be a named escape sequence or a numerical representation of a unicode codepoint.

Available escape sequences:

'\'' # single quote
'\\' # backslash
'\b' # backspace
'\e' # escape
'\f' # form feed
'\n' # newline
'\r' # carriage return
'\t' # tab
'\v' # vertical tab
'\uNNNN' # hexadecimal unicode character
'\u{NNNN...}' # hexadecimal unicode character

A backslash followed by a u denotes a unicode codepoint. It can either be followed by exactly four hexadecimal characters representing the unicode bytes (\u0000 to \uFFFF) or a number of one to six hexadecimal characters wrapped in curly braces (\u{0} to \u{10FFFF}.

'\u0041' # => 'A'
'\u{41}' # => 'A'
'\u{1F52E}' # => '🔮'

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https://crystal-lang.org/docs/syntax_and_semantics/literals/char.html