A wood face cord, or, more conventionally, a face cord of wood, is a measurement of the amount of firewood in a stacked pile. A standard cord of firewood is a measure of volume, but a face cord only reckons the depth and height of the pile, not the length.
Cords and face cords both deal with firewood that is stacked neatly and compactly, rather than in a chaotic mass. Traditionally, firewood pieces are stowed so that they lie parallel to one another and do not overlap. People often place them so that they lie along their vertical axis. A standard cord is such a stack of wood that is 4 feet high, 4 feet deep and 4 feet long. A face cord is 4 high and 8 feet deep; it can be of any length. Because a face cord accounts for only two dimensions of the pile, rather than three, it is not a measure of volume.