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by that_jojo 2380 days ago
Super late, but the term MCU refers to the actual chip -- analogous to SoC for the main chip on a raspi.

You don't call the raspi an SoC, and it's debatable that you'd call a prototyping platform like Arduino an MCU. The MCU is the main Atmel AVR, Microchip PIC, or similar part that drives such a board.