This code point first appeared in version 1.1 of the Unicode® Standard and belongs to the "Latin-1 Supplement" block which goes from 0x80 to 0xFF.
You can safely add this character in your html code with the entity: 
It is sometimes abbreviated as HOP.
This code point is sometimes referred as HIGH OCTET PRESET but this was never actually approved in any standard.
You can use the u+0081 copy pc button below.
Easy u+0081 copy paste:
Unicode meta-data
The following table show specific meta-data that is known about this character.The u+0081 name is high octet preset emoji.
| field | value |
|---|---|
| Codepoint (hex) | 0081, u0081 |
| Character age | Unicode 1.1 |
| Legacy name (Unicode 1.0) | - |
| Official name (Unicode 15.0) | - |
| figment label | HIGH OCTET PRESET |
| resolved name | high octet preset |
| block | Latin-1 Supplement (Latin_1_Sup) |
| common typos | u+0081, u+8001 |
There are alternative spelling that can be found in the wild for the unicode character 0081 like u 0081, (u+0081) or u +0081. You can also find u-0081, u*0081, un+0081, u0081, u=0081 or c+0081. You can also spell it with u 0081 unicode, u plus 0081, uncode 0081 or unicode + 0081.
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+0081 that are available on your computer.
In order to type this character easily, you may want to download and install a unicode Latin-1 Supplement 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 +u0081 allows you to see the value of the character in different encodings
| encoding | hexadecimal | decimal | binary |
|---|---|---|---|
| UTF-8 | C2 81 | 49793 | 11000010 10000001 |
| UCS2 | 81 00 | 33024 | 10000001 00000000 |
| UTF-16LE | 81 00 | 33024 | 10000001 00000000 |
| UTF-16BE | 00 81 | 129 | 10000001 |
| UTF7 | 2B 41 49 45 2D | 185778914605 | 00101011 01000001 01001001 01000101 00101101 |
| UTF7-IMAP | 26 41 49 45 2D | 164304078125 | 00100110 01000001 01001001 01000101 00101101 |