In the trial balance and in the voucher transactions forms balances from multiple currencies can be presented:

Transaction Currency

Accounting Currency

Reporting Currency

In the voucher transactions form the Transaction Currency abbreviation is mentioned for each transaction in the column 'Currency', but the abbreviations of the Accounting Currency and Reporting Currency are not visible. You need to find these at the Ledger setup. Not all users have access to this option (or it costs time to find these) and when you work in many legal entities with different currencies you can make mistakes in the interpretation of these columns.

I think it would be an improvement to present the symbol or the abbreviation in the Accounting Currency and Reporting Currency column headers in at least:

The trial balance form columns: Opening balance, debit, credit, Closing balance (including the Reporting currency balance columns when the accounting currency and reporting currency are different)

The voucher transactions form columns: Amount, Amount in reporting currency

Example:

Trial balance column header names in a legal entity using Accounting Currency EUR and Reporting Currency USD:

Opening balance (EUR), Debit (EUR), credit (EUR), Closing balance (EUR), Opening balance – Reporting currency (USD), Debit – Reporting currency (USD), Credit – Reporting currency (USD), Ending balance – Reporting currency (USD).