What does this icon in Messenger mean please?

[mamakoukla]

Bit bamboozled - what does this icon mean please? Photo attached. Thanks!

Where is the icon on the page?

I want to say it’s the filters/effects button, but I’m only 99% sure, I haven’t seen it in yonks.

It’s only when I do a video call.

And am listening to the ring tone

It's the filters button as takeyourposition said

So looks like this….

Ta!

Yes filters. I always end up playing with them whilst on messenger to someone