49+ Arduino Nano Spi Pins Pictures. click the image to enlarge it. Spi pins 10 (ss), 11 (mosi), 12 (miso) and 13 (sck):

Ks0173 Keyestudio Nano Ch340 Keyestudio Wiki
Ks0173 Keyestudio Nano Ch340 Keyestudio Wiki from wiki.keyestudio.com
The nano is inbuilt with the atmega328p microcontroller, same as mentioned earlier, arduino nano has 14 digital i/o pins that can be used either as digital input or output. The arduino nano is a microcontroller board, based on the atmega328p microcontroller by atmel. Before start programming for spi communication between two arduinos.

click the image to enlarge it.

These pins are used for spi communication. If the current consumption exceeds 100ma you should power the arduino nano via the vin. Before start programming for spi communication between two arduinos. The spi library only supports hardware spi (regardless of the arduino model).