Hidden character indesign meaning

Masked characters are signs found in a block of text that are used by the software for formatting, but are not used for printing.

For example, one sign is necessary to indicate the end of a paragraph and a line break, another indicates a tab, and so on.

These characters vary depending on the software; Word uses different signs from InDesign for the same function.

I am not aware of any list for InDesign. In the software, the display can be useful for troubleshooting or assisting with the layout of a text.