ASCII control codes. The first 32 ASCII characters.
NUL (null)                   
SOH (start of heading)       
STX (start of text)          
ETX (end of text)            
EOT (end of transmission) - Not the same as ETB    
ENQ (enquiry)                
ACK (acknowledge)            
BEL (bell) - Caused teletype machines to ring a bell.  Causes a beep
             in many common terminals and terminal emulation programs.
BS  (backspace) - Moves the cursor (or print head) move backwards (left)
                  one space.
TAB (horizontal tab) - Moves the cursor (or print head) right to the next
                       tab stop.  The spacing of tab stops is dependent
                       on the output device, but is often either 8 or 10.
LF  (NL line feed, new line) - Moves the cursor (or print head) to a new
                               line.  On Unix systems, moves to a new line
                               AND all the way to the left.
VT  (vertical tab)           
FF  (form feed) - Advances paper to the top of the next page (if the
                  output device is a printer).
CR  (carriage return) - Moves the cursor all the way to the left, but does
                        not advance to the next line.
SO  (shift out) - Switches output device to alternate character set.            
SI  (shift in)  - Switches output device back to default character set.
DLE (data link escape)       
DC1 (device control 1)       
DC2 (device control 2)       
DC3 (device control 3)       
DC4 (device control 4)       
NAK (negative acknowledge)   
SYN (synchronous idle)       
ETB (end of transmission block) - Not the same as EOT  
CAN (cancel)                 
EM  (end of medium)  
SUB (substitute)             
ESC (escape) 
FS  (file separator)
GS  (group separator)
RS  (record separator)
US  (unit separator)

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