This ` is called a backtick and you can find it on your keyboard here:
You will need to use backticks to create both multi line code blocks and inline code snippets
Multi Line Blocks of Code
If you would like to paste code in a chat, type ``` to open a code snippet.
This is the best way to show someone your code in the chat, as it renders as code with the correct formatting, and it will be readable.
Inline Code Snippets
If you want to post some code in line with your chat, you can just wrap that part of the text in backticks like this:
And it becomes, this: