# Signals & Chart Anatomy

**AIMS BRN** (Big Round Numbers) projects institutional psychological support and resistance levels across the chart.

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## Two-Tier Grid Hierarchy[​](#two-tier-grid-hierarchy "Direct link to Two-Tier Grid Hierarchy")

Institutional order flow, option strikes, and stop loss clusters congregate around key psychological round numbers:



* **Primary Levels (`InpBRNPrimary`)**: Drawn with solid lines (`STYLE_SOLID`) at major 100-pip/1,000-point intervals (such as 1.08000, 1.09000, or index marks like 18000, 19000).
* **Secondary Levels (`InpBRNSecondary`)**: Drawn with dotted lines (`STYLE_DOT`) at half-round intervals (such as 1.08500, 18500).

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## Dynamic Centering & Object Management[​](#dynamic-centering--object-management "Direct link to Dynamic Centering & Object Management")

* The grid automatically centers around the current market price, projecting `InpBRNTotal` levels above and below.
* Chart objects are tagged with the unique prefix `AIMS_BRN_` and automatically recycled without chart clutter or CPU lag.
* The calculation engine detects symbol digit quoting automatically (adapting across 5-digit forex, 2-digit gold, 3-digit JPY pairs, and indices).