terrorist financing

Known by a variety of names, "terrorist financing" is the more widely accepted term simply because it's the longest established. It's not the best term.

It is best to think of "providing material support" as the better term. This originated in the USA.

Details are in the relevant courses but in summary it's this: if a person provides financial or other assistance to anyone involved in the planning of, preparation for, execution of or escape from any act of terrorism, that person is guilty of an offence.