2D_Array.ino

char grid[4][4] = {{'a', 'b', 'c', 'd'},
                  {'e', 'f', 'g', 'h'},
                  {'i', 'j', 'k', 'l'},
                  {'m', 'n', 'o', 'p'}};

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println(grid[1][2]);
  delay(1000);
}