Meaning
A bright yellow or orange sun with rays shooting out in every direction. It stands for sunny weather, daytime and warmth, and by extension for a bright, cheerful mood.
It works for weather updates, beach plans and morning greetings: “Morning! Finally some sun after a week of rain ☀️” Some people also call a loved one their sunshine with it. Since this is an older symbol, a few apps may show a plain outline instead of the colorful version, but the meaning does not change.