telegraphic transfer
A financial term for transferring money via telegraph or wire; now often used broadly for electronic funds transfers.
I used a telegraphic transfer for the overseas remittance.
送金 is a general term for remittance or sending money, while 電信為替 specifically refers to the telegraphic transfer method.
為替 is a broader term for money exchange or remittance; 電信為替 is a specific type of 為替 done via telegraph.
Compound of 電信 (telegraph) and 為替 (money exchange/remittance). The term originated when telegraph lines were used to transmit money transfer instructions.