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If you want to enter a special character – like a bullet, an accent grave character, or a mathematical summation symbol – you can use the unicode equivalent in a textbox to do so. In the textbox, keyin Ctrl-Shift-U which puts you into single character unicode mode, then keyin the numerical value for the intended single character followed by the carriage return. For a voluminous list of possible special characters, you can go to https://unicode-table.com/en/ on the internet to choose by highlighting a character to get its numerical equivalence. For example, U + 2022 is a bullet. If you make a mistake, you can use the backspace key or if you want to exit unicode-insert-mode, use the ESC key. This feature is especially useful with the Title plugin and for naming Tracks in the main window.
However, it is worth mentioning that some special characters are available via the compose key in the current distribution. https://en.wikipedia.org/wiki/Compose_key