Each platform usually has a tool for entering in symbols.
Like on Windows there is the Character Map Tool

Mac OS has a character palette

On Linux, there are multiple character map tools depending on the desktop you are using.
For example, GNOME.

Each platform usually has a tool for entering in symbols.
Like on Windows there is the Character Map Tool

Mac OS has a character palette

On Linux, there are multiple character map tools depending on the desktop you are using.
For example, GNOME.
