Global variables issue mql5 - page 2
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Yes, that makes sense, but it really depends on how your Indicator reacts to chart changes.
If the indicator needs to reset data if you change time-frame, then it is best to keep track of the time-frame in the prefix. It it keeps that data, then it will be best NOT to use the time-frame in the prefix.
The same applies to the Symbol. If the Indicator needs to reset for a symbol change, then keep the symbol name in the prefix, but if it keeps the data regardless of the symbol, then don't use the symbol name in the prefix.