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Touchstone

usgb/ˈtʌtʃstəʊn/Volume
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Abstract StandardPlay
Often used metaphorically to represent an ideal that other things are compared against. SlideHer outstanding performance has become the touchstone for all future actors.
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Judgment ToolPlay
Use it to talk about methods of evaluation in various fields, from art to technology. SlideTheir app is the new touchstone for user-friendly design.
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Quality IndicatorPlay
A measure for comparing the excellence or merit of similar items or scenarios. SlideThis feature is the touchstone of a good smartphone.