Pssst vs. Psst — What's the Difference?

Pssst is an action video game developed and published by Ultimate Play the Game that was released for the ZX Spectrum in June 1983. In the game, Robbie the Robot has to protect his plant (a Thyrgodian Megga Chrisanthodil) as it is attacked by various insects, each of which needs a different repellent to neutralise it.

Used to capture someone's attention inconspicuously.

Alternative form of psst

(onomatopoeia) Implies that the speaker is sending secret or whispered information to another person.

(informal) To say psst, to get someone's attention or to communicate with them.