To use emojis on a Mac, you can follow these steps:

1. Open the application or text editor where you want to insert the emoji.
2. Place the cursor at the point where you want to insert the emoji.
3. Press the keyboard shortcut "Control + Command + Space" simultaneously. This will open the emoji picker window.
4. In the emoji picker window, you can browse and search for emojis using different categories.
5. When you find the emoji you want to use, click on it to insert it at the cursor's position.

Alternatively, you can also use the "Edit" menu in most applications and select "Emoji & Symbols" to access the emoji picker.

Please note that the availability of emojis may depend on the version of macOS you are using.

On Mac, you can type a "pipe" (||) symbol by typing Shift + \.

For a full list of keyboard shortcuts specific to macOS, you can visit Apple's Mac Keyboard Shortcut page here.