Iceberg order
Trader's Glossary · Order flow

Definition. A large limit order of which only a small part is visible in the book. Once the visible part is filled, another part automatically appears.
How it works
Large participants split their orders so as not to reveal the full scale of their interest. The book shows a small size, but the volume executed at that level is many times larger than what was visible.
Example
An order for a few contracts sits at a level, but several hundred were executed there. The order was continuously refilled, which is a sign of absorption.
What to watch out for
Hidden orders aren't directly visible. Their presence can only be inferred by comparing the visible liquidity with what actually traded.

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See also
Absorption, DOM (order book), Spoofing.
More in Hetman Capital Club
You'll find the full explanation with graphics, examples and exercises in the 📖 Order flow encyclopedia space, and its use in the live market in the 🔴 Live Room. Both are available to Club members (in Polish).
Educational content, not investment advice.