Why is an external function written like this?

Question

C++ / C#

Good afternoon! I saw a code example on NASM, where external functions are indicated:

extern  [email protected]
extern  [email protected]
extern  [email protected]

Question: why is it written this way (and not just the name of the function), because the dump of the object file just gives the names GetStdHandle, WriteFile, ExitProcess without these underscores, dogs and numbers?

Answer 1

Searched badly
https://en.wikipedia.org/wiki/Name_mangling

Answer 2

everything is crystal clear
true-coder.ru/php/pishem-registraciyu-na-php-i-jav...