Abbreviations that can be used in an alphanumeric shorthand systems.
braille
https://www.teachingvisuallyimpaired.com/uploads/1/4/1/2/14122361/ueb_braille_chart.pdf
morse
Some still useful abbreviations in use in morse code
ADS address
AGN again
C correct, yes CK check FM from FWD forward
N no, nine
NIL nothing
OK okay
PLS please
PPR paper
PX prefix
R received, roger
RPT repeat please
SF so far
SIG signature
TU thank you
WD word/words
Z zulu time UTC
WX weather, weather report
73 best regards (92 code)
88 love and kisses (92 code)
92 code (1901)
Relevant codes from The Telegraph Instructor G.M. Dodge.
6, I am ready
7, are you ready
15, for you and others to copy
18, what’s the trouble
27, priority, very important
28, do you get my writing
30, no more, the end
37, inform all interested
39, important, with priority on through wire
44, answer promptly 55, important
92, deliver promptly
https://en.wikipedia.org/wiki/Wire_signal
philips code 1879
IGO in consequence of
Kft conflict
Kpt compete
Oac on account of
Px price
Rept repeat
Mo month
hvnb have not been
https://en.wikipedia.org/wiki/Phillips_Code
medieval breviographs
p person, persons & and https://en.wikipedia.org/wiki/Breviograph