On Windows, press `Alt` + `0252` on the numeric keypad for `ü`, then copy a checkmark symbol like `✓` if needed
On Mac, press `Option` + `V` to type `√`
On Windows, use `Win` + `.` and search for `check` or `tick` in the emoji/symbol picker
On Linux, use `Ctrl` + `Shift` + `U`, type `2713`, then press `Enter` for `✓`
Copy and paste `✓` or `✔` from a symbol list
In Microsoft Word, type `2713` and press `Alt` + `X` for `✓`
In Google Docs, use `Insert` > `Special characters` and search for `checkmark`