Public bug reported:

I don't know much, so forgive me if I use the wrong terminology.

Problem:
There is no ComposeKey mapping for the symbols ≈ (Unicode 2248) and ≅ (Unicode 
2248) in Compose Tables.

Details:
According to  https://help.ubuntu.com/community/ComposeKey  the files such as  
/usr/share/X11/locale/en_US.UTF-8/Compose  have all ComposeKey combinations to 
type special symbols, characters and graphemes.
Two standard graphemes (≈ and ≅) seem to be missing from multiple compose files 
although their negated versions (are present mapped to compositions

Solution?!: I propose this (but wouldn't know how to commit it except by filing 
a bug - if it's straightforward to improve Linux, then please tell me how!  I'd 
love to commit something to the code!
I added these lines to a copy of the  compose  file that I made at ~/.Xcompose
I propose that they should be added to the multiple, original  Compose  files 
in:
  /usr/share/X11/locale/en_US.UTF-8/Compose
  /usr/share/X11/locale/iso8859-1/Compose
  /usr/share/X11/locale/iso8859-15/Compose
     etc etc etc

# _________________Added by Jackalux_____________________
<Multi_key> <asciitilde> <equal>        : "≅"   U2245 # APPROXIMATELY OR 
ACTUALLY EQUAL TO
<Multi_key> <equal> <asciitilde>        : "≅"   U2245 # APPROXIMATELY OR 
ACTUALLY EQUAL TO
<Multi_key> <asciitilde> <asciitilde>   : "≈"   U2248 # ALMOST EQUAL TO
# ____________End of Jackalux's additions________________


Notes:
The list at 
https://www.x.org/releases/X11R7.7/doc/libX11/i18n/compose/en_US.UTF-8.html 
also misses combinations for ≈ and ≅ .   Perhaps that should be updated too if 
it is a reference list.

I also wanted to add:
<Multi_key> <equal> <asciitilde> <slash>        : "≇"   U2247 # NEITHER 
APPROXIMATELY NOR ACTUALLY EQUAL TO
<Multi_key> <asciitilde> <equal> <slash>        : "≇"   U2247 # NEITHER 
APPROXIMATELY NOR ACTUALLY EQUAL TO
<Multi_key> <slash> <equal> <asciitilde>        : "≇"   U2247 # NEITHER 
APPROXIMATELY NOR ACTUALLY EQUAL TO
<Multi_key> <slash> <asciitilde> <equal>        : "≇"   U2247 # NEITHER 
APPROXIMATELY NOR ACTUALLY EQUAL TO
<Multi_key> <asciitilde> <asciitilde> <slash>   : "≉"   U2249 # NOT ALMOST 
EQUAL TO
<Multi_key> <slash> <asciitilde> <asciitilde>   : "≉"   U2249 # NOT ALMOST 
EQUAL TO
But I've realised that they create clashes with other compositions, as the 
composition forms before the ComposeKey is released.
If this can be corrected and added at the same time, then that would be amazing 
as I don't know how to access the actual compositions listed for those 
characters.

Co-operatively,
Jackalux

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1854590

Title:
  No ComposeKey sequence for ≈ (almost equal) and ≅ (approximately
  equal)

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