Difference between currency, currency_short and currency_symbol in Handlebars

While creating your own invoice templates, you can take advantage of three Handlebars variables defining currency:

1. currency - always shows the currency in letters (EUR, USD, PLN)

2. currency_short - always shows the currency abbreviation (€, $, zł)

3. currency_symbol - either shows the currency in letters or abbreviation, depending on the settings in Settings > Account settings > Print settings > Currency symbol.