Yahoo mail @!@invisible

Dee - Oct 20, 2015 at 02:36 PM
Hello, What does it mean when you see this (@!@invisible) as a folder on yahoo mail? My inbox said I had 10 new emails however I couldn't see them, then I noticed in my folders where it has Sent, Draft, inbox, trash ECT. That there was a folder named @!@invisible.... I never created this but when I clicked on it, it disappeared!! I changed my password and am now receiving my mail as normal but I'm wondering what that was ? A virus maybe?