2.NounA huge mass of ocean-floating ice which has broken off a glacier or ice shelf
"The Titanic hit an iceberg and sank."
3.NounAn aloof person.
4.NounAn impending disastrous event whose adverse effects are only beginning to show.
5.NounA topic that is more convoluted and fractal than it may seem.
"Do some digging into that politician's past life and associates, and you'll see that the iceberg runs deep.; There's a massive iceberg of increasingly crazy fanfics out there based around those two characters.; Check out the gaming iceberg on this post! There's some really freaky titles there that I've never heard of.; Today we're gonna talk about the Star Wars iceberg."
6.NounA list, infographic, or other enumeration of such a topic and its subcomponents, often ordered into groups sorted by obscurity and bizarreness.
"Check out the gaming iceberg on this post! There's some really freaky titles there that I've never heard of.; Today we're gonna talk about the Star Wars iceberg."