Exclamation mark (! Used at the end of a sentence to express surprise, exclamation or exclamation. People's Republic of China (PRC)'s Usage of Punctuation Symbols also points out that "stop at the end of an exclamation sentence and use an exclamation mark." "At the end of imperative sentences, exclamation marks are also used." "At the end of rhetorical questions with strong tone, exclamation marks are also used."

It is generally believed that "!" This symbol originated from full-time work before printing in medieval Europe. It is specially used for handwritten documents of private or public affairs, and is used to mark the end of surprise sentences. The Latin word "[io]" originally meant "Long live". Under the evolution of time, I stayed in the upper position of O and rented the liquid code, which became the exclamation point I use now.

Excessive use of exclamation marks, like excessive emotions, will be considered bad in literature. In advertisements, exclamation marks are often used to attract people's attention. Some brands or titles even have exclamation marks, such as Yahoo! , "Luo Qiuhui!" And so on.

In math! It is the symbol of factorial. For all positive integers n, {\displaystyle n! = 1 time 2 times 3 times ... \ times n }；; And the rule is 0! = 1。

Some programming languages use "! = "means not equal to. At this time, the sigh is called "bang" or "scream" In geek code, "!" Geeks don't want to answer relevant questions. In the chess manual, "!" Said a good move, "! ! "Represents a wonderful work.

There are some exclamation marks in place names in the world, such as "West to Hao!" In Devon, England. And "St. Louis, Quebec, Canada! Ha! " .