The term 'striking effect' can be summarized with the word 'ECLAT', which is a French term meaning 'splendor, brilliance, or showiness'. It is often used to describe a sudden and dramatic impact that something has on its surroundings. This could be a physical effect, such as a loud noise, or a more abstract effect, such as a powerful speech. In either case, the effect is usually unexpected and attention-grabbing.