This week's theme is Guess That Object. So, what is it?

I have discovered one problem with the macro setting - you can see something you'd MUCH rather not see - all that dust!

I am EXTREMELY embarrassed. But, I'm also lazy - and the laziness won out. No taking a new pic!

So, please pardon my dust. (And, yes, I'm cleaning it once I'm done posting here!) And, tell me if you dare - what is it?