From The Free On-line Dictionary of Computing (19 January 2023):
exclamation mark
!
excl
exclamation point
shriek
<character> The character "!" with ASCII code 33.
Common names: bang; pling; excl (/eks'kl/); shriek; ITU-T:
exclamation mark, exclamation point (US). Rare: factorial;
exclam; smash; cuss; boing; yell; wow; hey; wham; eureka;
soldier; INTERCAL: spark-spot.
The Commonwealth Hackish, "pling", is common among Acorn
Archimedes owners. Bang is more common in the USA.
The occasional CMU usage, "shriek", is also used by APL
fans and mathematicians, especially category theorists.
Exclamation mark is used in C and elsewhere as the logical
negation operation (NOT).
(1998-09-17)