The term 'Quantity of Firewood' can be represented by the four-letter word 'RICK'. This is a reference to the character RICK Grimes from the popular television series The Walking Dead. In the show, RICK is often seen gathering firewood for his group, which is a metaphor for the need to provide for his family and friends. Therefore, the term 'Quantity of Firewood' can be interpreted as a representation of the need to provide for one's loved ones.