Backslash Notations

\n                  # Newline (0x0a)
\r                  # Carriage return (0x0d)
\f                  # Formfeed (0x0c)
\b                  # Backspace (0x08)
\a                  # Bell (0x07)
\e                  # Escape (0x1b)
\s                  # Space (0x20)
\x                  # Character x``
\nnn                # Octal (n = 0-7)
\xnn                # Hesadecimal (n = 0-9, a-f, A-F)
\cx, \C-x           # Control-x
\M-x                # Meta x; usually used for keyboard/terminal control
\M-\C-x             # Meta-Control-x; usually used for keyboard/terminal control
\unnnn              # Unicode code point U+nnnn (Ruby 1.9+)
puts "ln1\nln2"     # Newline (0x0a); prints two lines
puts "n123\rab"     # Carriage return (0x0d); prints one line, "ab23"
puts "f12\f345"     # Formfeed (0x0c); prints two lines, offset
puts "abc\bx"       # Backspace (0x08); prints 'abx'
puts "bell\a\a\a"   # Bell (0x07); prints 'bell' and rings bell three times
puts "ab\ecd"       # Escape (0x1b); prints 'abd'
puts "ab\scd"       # Space (0x20); prints 'ab cd'
puts "ab\xcd"       # Character x; prints 'abxcd'
puts "ab\015x"      # Octal (n = 0-7); prints 'xb', same as \r
puts "ab\xdx"       # Hesadecimal (n = 0-9, a-f, A-F); prints 'xb', same as \r
puts "abc\C-Hxyz"   # Control-x; prints 'abxyz', same as \b; \C-@ == \x00, \C-A == \x01, ...  
puts "\u2713"       # Unicode code point U+nnnn (Ruby 1.9+); prints "✓"