For example, the Nvidia Tegra 4 is described as having 4 + 1 CPU cores. Is this simply a conventional way of saying that it has 5 cores, or does that phrasing imply something different?
http://www.nvidia.com/object/tegra-4-processor.html
Answer
It's an extra core used when the higher power CPU (4 cores) isn't necessary.
Nvidia has settled on a name for the unique processor architecture
used for its quad-core Tegra 3 chip – 4-PLUS-1. The "PLUS-1" refers to
the mobile processor's fifth core, a "battery-saver" core that runs on
very low power and executes tasks at low frequency when the chip's
more powerful and power-hungry ARM Cortex-A9 cores aren't needed.
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