My iPad is connected to a unknown headphone

Device : iPad Air 2 :For the last 2 days my iPad has no sound , when I go to YouTube or other apps , I can’t play any sound , when I scroll down the screen to see the sound status , it’s showing an headphone like symbol , I restarted my iPad , turned off Bluetooth, flight mode etc . but nothing is helping me , I even watched videos on you tube how to fix it but ...... my iPad doesn’t have sound 🥲..... so I request you can you tell me how to fix it , Regards . And one more thing there’s no headphone in my house 👻👻