I discovered the other day the the exclamation mark (!), which is apparently known as an exclamation point in American English, has a number of other names. When it was first introduced by printers in the 15th century, it was known as a sign of admiration or exclamation or the note of admiration in English.
In the early 20th century it was known as an ecphoneme [source]. A related word is eroteme, which is another name for the question mark (?), and comes from the Ancient Greek ἐρώτημα (erṓtēma – question), from ερωτώ (erotó – to ask) [source].
In 1950s American typesetting manuals it was referred to as a bang. Related punctuation marks are the interrobang (‽), a combination of an exclamation mark and question mark that was invented in 1962 by Martin K. Speckter, an American advertising executive [source], and the gnaborretni (⸘), an inverted interrobang [source].
Printers might call it a screamer, gasper, slammer or startler.
British hackers apparently call it, or called it, a shriek or pling, which is my favourite name for this punctuation mark.
In Welsh the exclamation mark is known as a ebychnod, from ebychu (to exclaim) and nod (mark), or rhyfeddnod, from rhyfedd (strange, odd) and nod.
In Armenian the equivalent of the exclamation mark (see below) is known as a Բացականչական նշան (Bats’akanch’akan nshan) or “exclamatory mark/sign” or “screamer”.
Here are some exclamation marks in other alphabets:
What is the exclamation mark called in other languages?
Here’s a video I made last week about the word exclamation: