It's not really a polite thing to notice or talk about. But "unibrow" is one term used.
Unibrow - Wikipedia, the free encyclopedia
Could anyone please give me the word for the kind of eyebrows that meet above the nose?
Do we call it joined eyebrow?
Monobrow or unibrow for me.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.