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On the title bar of the chart, in the Region Data Line and other places where a Symbol is displayed, the Symbol may have a [M] designation after it.

This means that Symbol is remapped to an alternate data feed and not the primary data feed Sierra Chart is connected to. Sierra Chart supports multiple data feeds with separate connections. The letter M is from the word map.

When using a sub instance of Sierra Chart through File >> New Instance, all data originates from the main instance of Sierra Chart. So in no case will you see the [M] indicator on the chart after the symbol. This is completely normal. It is just enough that you see it in the main instance of Sierra Chart for the symbol.