Is the VIN for the power?

I've got the Arduino Nano that has the port name said VIN. Is that for the power supply? If yes, is it for the power of 7-12 V(recommended voltage), or 5V(operating voltage). If not, where to supply the board with the power from the battery?

Yes Vin is for the power supply. It is a point before the on-board regulator, it means 7-12V.

Thank You! @Budvar10