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I arducopter code " define " Tab I see

/* Expansion PIN's that people can use for various things. */

// AN0 - 7 are located at edge of IMU PCB "above" pressure sensor and
// Expansion port
// AN0 - 5 are also located next to voltage dividers and sliding SW2 switch
// AN0 - 3 has 10kOhm resistor in serial, include 3.9kOhm to make it as
// voltage divider
// AN4 - 5 are direct GPIO pins from atmega1280 and they are the latest pins
// next to SW2 switch
// Look more ArduCopter Wiki for voltage dividers and other ports
#define AN0  54  // resistor, vdiv use, divider 1 closest to relay
#define AN1  55  // resistor, vdiv use, divider 2
#define AN2  56  // resistor, vdiv use, divider 3
#define AN3  57  // resistor, vdiv use, divider 4 closest to SW2
#define AN4  58  // direct GPIO pin, default as analog input, next to SW2
                 // switch
#define AN5  59  // direct GPIO pin, default as analog input, next to SW2
                 // switch
#define AN6  60  // direct GPIO pin, default as analog input, close to
                 // Pressure sensor, Expansion Ports
#define AN7  61  // direct GPIO pin, default as analog input, close to
                 // Pressure sensor, Expansion Ports

// AN8 - 15 are located at edge of IMU PCB "above" pressure sensor and
// Expansion port
// AN8 - 15 PINs are not connected anywhere, they are located as last 8 pins
// on edge of the board above Expansion Ports
// even pins (8,10,12,14) are at edge of board, Odd pins (9,11,13,15) are on
// inner row
#define AN8  62  // NC
#define AN9  63  // NC
#define AN10  64 // NC
#define AN11  65 // NC
#define AN12  66 // NC
#define AN13  67 // NC
#define AN14  68 // NC
#define AN15  69 // NC

Can you please make me understand what are " AN " and the value beside them..?