point of reference

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WordNet Dictionary
	Definition:		[n]  an indicator that orients you generally; "it is used as a reference for comparing the heating and the electrical energy involved"
	Synonyms:		reference, reference point
	See Also:		bench mark, benchmark, buoy, criterion, indicator, landmark, lubber line, lubber's line, lubber's mark, lubber's point, mark, measure, standard, target, touchstone, white line