What does this symbol mean on WhatsApp ?

[SpringtimeSummertime]

The circle on the right? Like a timer ? See pic

It’s only on one contact. None f my other contacts have it.

It tells you here. It's to do with the message leaving your device.

I think it's to do with the new update where you can have some messages delete themselves after a certain time period.

faq.whatsapp.com/android/chats/how-to-turn-disappearing-messages-on-or-off/?lang=en

That’s it Zero Thank you!