The triangle is legal terms is defendant, in science its change.
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They are not asking for a reduction in charge(based on the limited information provided here) but instead they appear to have set an agreed plea date. the triangle is just a short way of writing "defendant." So the attorney has asked the coordinator to ensure that the defendant is brought to court that morning.
as my colleagues have mentioned, the triangle is the symbol for Delta which was the greek letter for D as in "defendant."
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