What is the meaning of Iceberg?

The seaward end of a glacier.

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

An aloof person.

An impending disastrous event whose adverse effects are only beginning to show.

A topic that is more convoluted and fractal than it may seem.

A list, infographic, or other enumeration of such a topic and its subcomponents, often ordered into groups sorted by obscurity and bizarreness.

iceberg

iceberg

iceberg

iceberg (huge mass of floating ice)

iceberg

Source: wiktionary.org