I Need Help For An Iceberg

The full term is Iceberg Tier Parody. Know Your Meme says:

Iceberg Tiers Parodies are usually images of an iceberg, captioned humorously so as to convey that the tip of the iceberg is the summation of the knowledge of most people, while the much larger submerged part of the iceberg is the sum of all knowledge of a particular topic. These parodies are often used in the context of imageboards like 4chan to ridicule outsiders, but they have also spread to fandoms.

A relevant example of one:



Made by Twitter user thechairlord