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The NRF51 series refers to a family of low-power System-on-Chip (SoC) devices developed by Nordic Semiconductor. These SoCs are primarily designed for Bluetooth Low Energy (BLE) applications but can also support other wireless protocols. The NRF51 series is based on a 32-bit ARM Cortex-M0 processor and is known for its energy efficiency, making it well-suited for battery-operated devices.