Meaning
The letters SOS on a square button, the international distress signal. It means help, an emergency or a call for urgent assistance.
In real emergencies people still call the proper number, but in chat it is a dramatic plea for help with homework, outfits, cooking disasters or tech trouble: “🆘 How do I get red wine out of a white shirt?” It pairs with 😭, 🙏 or 🚨 for extra urgency.