Step 1: Determine the UTF-8 encoding bit layout
The character ⇑ has the Unicode code point U+21D1. 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+21D1 to binary:
00100001 11010001. 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 10000111 10010001
UPWARDS DOUBLE ARROW·U+21D1
⇑
Character Information
Code Point
U+21D1
HEX
21D1
Unicode Plane
Basic Multilingual Plane
Category
Other Symbol
Character Representations
Click elements to copy| Encoding | Hex | Binary |
|---|---|---|
| UTF8 | E2 87 91 | 11100010 10000111 10010001 |
| UTF16 (big Endian) | 21 D1 | 00100001 11010001 |
| UTF16 (little Endian) | D1 21 | 11010001 00100001 |
| UTF32 (big Endian) | 00 00 21 D1 | 00000000 00000000 00100001 11010001 |
| UTF32 (little Endian) | D1 21 00 00 | 11010001 00100001 00000000 00000000 |
HTML Entity
⇑
URI Encoded
%E2%87%91
Description
The Unicode character U+21D1 represents the "UPWARDS DOUBLE ARROW" symbol (⇑). In digital text, this character is commonly used to indicate an upward movement or direction, often in graphical representations of data flow or logic diagrams. It is not tied to any specific cultural, linguistic, or technical context, but its versatility allows it to be applied across various fields and disciplines. Its use can be seen in programming, physics, computer science, mathematics, and more. As a result, U+21D1 plays an important role in facilitating clear communication of directions, relationships, and processes within digital text across multiple industries.
How to type the ⇑ symbol on Windows
Hold Alt and type 8657 on the numpad. Or use Character Map.