This code point first appeared in version 1.1 of the Unicode® Standard and belongs to the "Basic Latin" block which goes from 0x0 to 0x7F.
You can safely add this character in your html code with the entity: 
It is sometimes abbreviated as EOT.
As a control character, it can be referenced as END OF TRANSMISSION.
You can use the u+0004 copy pc button below.
Easy u+0004 copy paste:
Unicode meta-data
The following table show specific meta-data that is known about this character.The u+0004 name is end of transmission emoji.
| field | value |
|---|---|
| Codepoint (hex) | 0004, u0004 |
| Character age | Unicode 1.1 |
| Legacy name (Unicode 1.0) | END OF TRANSMISSION |
| Official name (Unicode 15.0) | - |
| resolved name | end of transmission |
| block | Basic Latin (ASCII) |
| common typos | u+0004, u+0004 |
There are alternative spelling that can be found in the wild for the unicode character 0004 like u 0004, (u+0004) or u +0004. You can also find u-0004, u*0004, un+0004, u0004, u=0004 or c+0004. You can also spell it with u 0004 unicode, u plus 0004, uncode 0004 or unicode + 0004.
Its bidirectional class is "BN":Boundary Neutral (Default ignorables, non-characters, and control characters, other than those explicitly given other types.)
Glyphs and symbols in your browser
The following unicode chart presents different versions of the glyph corresponding to the unicode characters u+0004 that are available on your computer.
In order to type this character easily, you may want to download and install a unicode Basic Latin keyboard.
A sample of fonts are used below to display whether the character has a glyph in this font or not.
Encodings (Unicode characters converter)
The following character table converter for +u0004 allows you to see the value of the character in different encodings
| encoding | hexadecimal | decimal | binary |
|---|---|---|---|
| UTF-8 | 04 | 4 | 00000100 |
| UCS2 | 04 00 | 1024 | 00000100 00000000 |
| UTF-16LE | 04 00 | 1024 | 00000100 00000000 |
| UTF-16BE | 00 04 | 4 | 00000100 |
| UTF7 | 2B 41 41 51 2D | 185778393389 | 00101011 01000001 01000001 01010001 00101101 |
| UTF7-IMAP | 26 41 41 51 2D | 164303556909 | 00100110 01000001 01000001 01010001 00101101 |