To escape characters in PowerShell, such as brackets [], double quotes "", and pipe |, you can use the backtick () character before the special character. This allows you to use these characters in your commands or scripts without them being interpreted as part of the syntax. For example, to escape the double quotes, you can use the backtick like this: "Hello, World!". Similarly, to escape brackets, you can use the backtick before them like this: [1, 2, 3].