APL FUNCTIONAL SYMBOL QUAD BACKSLASH·U+2342

Character Information

Code Point
U+2342
HEX
2342
Unicode Plane
Basic Multilingual Plane
Category
Other Symbol

Character Representations

Click elements to copy
EncodingHexBinary
UTF8
E2 8D 82
11100010 10001101 10000010
UTF16 (big Endian)
23 42
00100011 01000010
UTF16 (little Endian)
42 23
01000010 00100011
UTF32 (big Endian)
00 00 23 42
00000000 00000000 00100011 01000010
UTF32 (little Endian)
42 23 00 00
01000010 00100011 00000000 00000000
HTML Entity
⍂
URI Encoded
%E2%8D%82

Description

The Unicode character U+2342 represents the APL Functional Symbol Quad Backslash in digital text. This typographical symbol has a significant role in programming languages and mathematical notation systems. Specifically, it is used to signify the operation of backslashing or redefining a function in the context of APL (A Programming Language). Developed by Charles Wheelwright in 1962, APL is a high-level, array-oriented programming language known for its concise notation and efficient computation. Its unique symbol set, which includes U+2342 among others, has been influential in the development of modern computer languages and mathematical notations.

How to type the symbol on Windows

Hold Alt and type 9026 on the numpad. Or use Character Map.

  1. Step 1: Determine the UTF-8 encoding bit layout

    The character has the Unicode code point U+2342. In UTF-8, it is encoded using 3 bytes because its codepoint is in the range of 0x0800 to 0xffff.

    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 the x are the payload bits.

    UTF-8 Encoding bit layout by codepoint range
    Codepoint RangeBytesBit patternPayload length
    U+0000 - U+007F10xxxxxxx7 bits
    U+0080 - U+07FF2110xxxxx 10xxxxxx11 bits
    U+0800 - U+FFFF31110xxxx 10xxxxxx 10xxxxxx16 bits
    U+10000 - U+10FFFF411110xxx 10xxxxxx 10xxxxxx 10xxxxxx21 bits
  2. Step 2: Obtain the payload bits:

    Convert the hexadecimal code point U+2342 to binary: 00100011 01000010. Those are the payload bits.

  3. 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 10001101 10000010