"DecoTurf" is not a common name, but a brand name. It is also not a genericized trademark. We may need a broader term to classify surfaces. "Hardcourt" seems to be used exclusively for tennis courts, literally does not refer to a certain material. However, most of hardcourt surface are acrylic based, which is one of the ITF's classification of tennis court surface types. So I think "acrylic" is a suitable value to classify the surface of the courts.
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