Hopefully this example clears it up for you.
After market hours on Nov 30, you run your ToDo List & get this signal. There is no new data that could change the signal, since it's after market hours, so we know it's valid. The signal tells us to enter the trade anytime between now & market open, so that it executes at market open tomorrow.
Any time after market open on Dec 1, you run your ToDo List. New data for Dec 1 is received & it's associated bar begins. The above signal then changes to a solid triangle, but is still on the same bar.
Clicking that signal now reveals this. The signal is in trade at this point. Had you traded it with a broker, it would be in a position having executed on Dec 1 market open.
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