iceberg

noun6

1. •
   A huge mass of ocean-floating ice which has broken off a glacier or ice shelf

   • The Titanic hit an iceberg and sank.
2. •
   (slang, figurative) A 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.
3. •
   (slang, figurative) A 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.
4. •
   (figurative) An impending disastrous event whose adverse effects are only beginning to show.

   • He has little to lose: at present he will go down in history, alongside George W. Bush, as a skipper who ignored the looming fiscal iceberg. — 2013
5. •
   (US, slang) An aloof person.
6. •
   (no longer used) The seaward end of a glacier.