iPad Pro Can someone please tell me what does this icon mean ? and what does it do ? in the Mail APP on the iPad?

[marcusalwayswins]

Can someone please tell me what does this icon mean in the mail what does it do ? and what does it mean ?

Please check the screenshot

 

[Isengardtom]

It filters on your unread mails by default but you can customise this

 

[cupcakes2000]

It’s the filter. Tap on it, then the appears a new button next to it, with ‘unread’ being the default. Tap on that and you can define other filters