Raptor 3 uses acoustic igniters instead of spark igniters. 👀🧐
"Acoustic igniters rely on the interaction between a supersonic jet flow issuing from a nozzle and a resonance tube placed closely downstream, producing a dramatic increase in temperature in the resonance tube. This increase in temperature will cause the gases to ignite, thus creating an igniter."
Article: https://www.nasaspaceflight.com/2026/05/starship-flight-12-block-3-pad-2/