Liquid engine variable list for Invoice Theme

Could you please create a page with liquid engine variables used in the Invoice themes, so people can add specific variables to the themes. For instance, I would like to include the currency in the “Amount” or “Unit price” column, but I can’t seem to figure out which variables are possible to use.

All variables are actually used within all themes. So by looking at any theme code, you can see what variables are available to use.

Currency in “Amount” column will be shown automatically if you set Base Currency under Settings tab.

And Unit Price column will be shown also automatically if you enter anything into Qty column when creating invoice, quote or order.