General information

ID 21
Char 
Unicode name <control-0015>
Unicode group Basic Latin
Unicode Code Point U+15
HTML Entity (decimal) &#21;
HTML Entity (hex) &#x15;
UTF-8 (hex) 0x15
UTF-8 (octal) 25
UTF-8 (binary) 00010101
UTF-16 (hex) 0x0015
UTF-16 (decimal) 21
UTF-32 (hex) 0x00000015
UTF-32 (decimal) 21

How to type 

Microsoft Windows Alt + 21
Microsoft Office write 15 then press Alt + X
Microsoft Office (alternative) write U+15 then press Alt + X
Apple Mac Hold Alt, type 1 5 then release
Apple Mac (alternative) Hold Option, type 1 5 then release
C / C++ / Java "\u15"
Python u"\u15"