Joseph's recent emailed newsletter about "Typing and Writing Symbols" was interesting. It reminded me of the days when I taught business communication and computing.
One of the things I taught students was how to create symbols on their computers that were not available on their keyboards. These symbols, as some of you will know, are part of the ASCII (American Standard Code for Information Interchange) which you can find here: https://theasciicode.com.ar/
The article tells you how to make the symbols appear on your screen.
Wordprocessing programs also usually include a character/symbol set you can access. For example, in the latest version of MS Word, you select <Insert> and then <Symbol> that appears on the right side of the menu bar.
Try it and see how it works.
PS:
Originally, it was intended for the Australian dollar symbol to have two vertical lines through the S to distinguish it from the US dollar. Because most keyboards only have one dollar sign ($), it became easier to use $AUD or $5,000 AUD when necessary.