theres a symbol of like the top of a human in the top left of my iphone 12. what is it ? what does it mean ? its next to the time

The support article you came here from should provide you with the answer to your question. Have you reviewed it yet? If so, and they didn't help, I suggest that you contact Apple Support directly. To do so, simply select the "Get Support" link in the upper right-hand side of this forum's web page.

Can you post a screen shot?

This is indicative of having a Personal Focus being turned on.