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Order Blocks Explained

Order blocks are price areas where strong buying or selling activity may have started a meaningful move.

Order block zones acting as supply and demand areas after an impulse move

The short answer

An order block is an area of interest. It suggests where a large move may have originated, but it does not guarantee that price will reverse when it returns.

The Core Idea​

Traders mark order blocks because they want to identify zones where strong participants may have acted.

A bullish order block is often associated with the last down candle or consolidation before a strong upward move.

A bearish order block is often associated with the last up candle or consolidation before a strong downward move.

Why Price May React​

Price may react at an order block because:

  • unfilled orders may remain nearby;
  • prior participants may defend the area;
  • trapped traders may exit;
  • the zone overlaps with value, VWAP, or support/resistance;
  • other traders are watching the same level.

The reaction is possible, not guaranteed.

Stronger Order Block Context​

An order block usually deserves more attention when it:

  • starts a clear displacement move;
  • breaks market structure;
  • forms with unusual volume or delta;
  • aligns with higher-timeframe trend;
  • overlaps with VWAP, volume profile, or a fair value gap;
  • has not been repeatedly tested.

Order Blocks and Absorption​

When price returns to an order block, watch the reaction.

If aggressive selling enters a bullish block but price refuses to move lower, buyers may be absorbing. If aggressive buying enters a bearish block but price cannot move higher, sellers may be absorbing.

This is where delta and volume become useful.

Using ZenAlgo​

Heavy Delta includes order-block boxes and related reaction symbols. Its broader table also helps compare order-block reactions with trend, value, delta, and signal context.

Use volume profile, VWAP, and market structure to judge whether an order block is located in a place that actually matters.

Practical Checklist​

  1. Did the block start a meaningful move?
  2. Did it break structure or create displacement?
  3. Is it fresh or already used?
  4. Does it align with higher-timeframe context?
  5. Is reaction supported by delta or volume?
  6. Where is the idea invalidated?

Continue Learning​

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Risk notice

Order blocks are subjective zones. They can fail, be front-run, or become irrelevant when market context changes.