TRF is a short form that used to signify the TRANSFER term. It’s a transfer from one bank account to the other account of the same bank account.
People use the term TRF in the bank statements, which is generally used to indicate that the money debited or credited to the bank account from another bank account.
In some situations, the word TRF may also denote the transfer of the sum done by or done to a third party.
In brief, it typically denotes the transaction of money between the two accounts.
For instance, the transfer of funds to another bank account of the same bank.