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Answering my own question:

> TPR-3 is a composite hardware environment score for a three-machine configuration, derived from all test types for TPR-tagged <T> frameworks. (More about TPR frameworks and TPR-1 versus TPR-3)[1]

[1] https://github.com/TechEmpower/FrameworkBenchmarks/wiki/Tech...

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Indeed, this is related to our (experimental) addition of a performance rating for the hardware environment we're testing on. This is rendered as the big number on the composite scores page. Theoretically, our benchmarks covering a diverse spectrum of technologies could be useful for measuring hardware and network performance. But a full run of all test implementations takes 111 hours, and I suspect few people who want to measure hardware performance would be willing to wait that long. So we selected a subset to use for hardware measurement, hence the icon you see.

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