Step 1: Determine the UTF-8 encoding bit layout
The character ₁ has the Unicode code point U+2081. In UTF-8, it is encoded using 3 bytes because its codepoint is in the range of
0x0800to0xffff.
Therefore we know that the UTF-8 encoding will be done over 16 bits within the final 24 bits and that it will have the format:1110xxxx 10xxxxxx 10xxxxxx
Where thexare the payload bits.UTF-8 Encoding bit layout by codepoint range Codepoint Range Bytes Bit pattern Payload length U+0000 - U+007F 1 0xxxxxxx 7 bits U+0080 - U+07FF 2 110xxxxx 10xxxxxx 11 bits U+0800 - U+FFFF 3 1110xxxx 10xxxxxx 10xxxxxx 16 bits U+10000 - U+10FFFF 4 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx 21 bits Step 2: Obtain the payload bits:
Convert the hexadecimal code point U+2081 to binary:
00100000 10000001. Those are the payload bits.Step 3: Fill in the bits to match the bit pattern:
Obtain the final bytes by arranging the paylod bits to match the bit layout:
11100010 10000010 10000001
SUBSCRIPT ONE·U+2081
₁
Character Information
Code Point
U+2081
HEX
2081
Unicode Plane
Basic Multilingual Plane
Category
Other Number
Character Representations
Click elements to copy| Encoding | Hex | Binary |
|---|---|---|
| UTF8 | E2 82 81 | 11100010 10000010 10000001 |
| UTF16 (big Endian) | 20 81 | 00100000 10000001 |
| UTF16 (little Endian) | 81 20 | 10000001 00100000 |
| UTF32 (big Endian) | 00 00 20 81 | 00000000 00000000 00100000 10000001 |
| UTF32 (little Endian) | 81 20 00 00 | 10000001 00100000 00000000 00000000 |
HTML Entity
₁
URI Encoded
%E2%82%81
Description
The Unicode character U+2081, also known as SUBSCRIPT ONE, is a typographical symbol with a significant role in digital text. This character is utilized to represent the numeral '1' when positioned below another character or symbol, creating a subscript notation. Its primary usage lies in mathematical expressions, chemical formulas, and other areas where subscript representation is necessary for clarity and accuracy. SUBSCRIPT ONE helps avoid confusion and misinterpretation of complex equations or formulae by clearly indicating its position relative to the base character. The use of SUBSCRIPT ONE contributes to consistency and precision in various fields such as physics, chemistry, and computer science, where subscript notation is widely employed.
How to type the ₁ symbol on Windows
Hold Alt and type 8321 on the numpad. Or use Character Map.