Backslashes can also be used to escape tabs, arbitrary Unicode characters, and various other things that can't be reliably print

Question

What these mean

Answer 1

that when you use print statement you can use \ in the string to output tabs(example: four spaces in code, indentation), unicode characters(arrows, smileys etc) and other things that you can't print that well(backslash itself, etc)

Answer 2

Backslashes can also be used to escape tabs, arbitrary Unicode characters, and various other things that can't be reliably printed. These characters are known as escape characters.