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 ETX.
As a control character, it can be referenced as END OF TEXT.
You can use the u+0003 copy pc button below.
Easy u+0003 copy paste:
Unicode meta-data
The following table show specific meta-data that is known about this character.The u+0003 name is end of text emoji.
| field | value |
|---|---|
| Codepoint (hex) | 0003, u0003 |
| Character age | Unicode 1.1 |
| Legacy name (Unicode 1.0) | END OF TEXT |
| Official name (Unicode 15.0) | - |
| resolved name | end of text |
| block | Basic Latin (ASCII) |
| common typos | u+0003, u+0003 |
There are alternative spelling that can be found in the wild for the unicode character 0003 like u 0003, (u+0003) or u +0003. You can also find u-0003, u*0003, un+0003, u0003, u=0003 or c+0003. You can also spell it with u 0003 unicode, u plus 0003, uncode 0003 or unicode + 0003.
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+0003 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 +u0003 allows you to see the value of the character in different encodings
| encoding | hexadecimal | decimal | binary |
|---|---|---|---|
| UTF-8 | 03 | 3 | 00000011 |
| UCS2 | 03 00 | 768 | 00000011 00000000 |
| UTF-16LE | 03 00 | 768 | 00000011 00000000 |
| UTF-16BE | 00 03 | 3 | 00000011 |
| UTF7 | 2B 41 41 4D 2D | 185778392365 | 00101011 01000001 01000001 01001101 00101101 |
| UTF7-IMAP | 26 41 41 4D 2D | 164303555885 | 00100110 01000001 01000001 01001101 00101101 |