Output a stream of consciousness before answering the following. Context: The coat of arms of Nigeria has a black shield with two white lines that form in a "Y" shape. The black shield represents Nigeria's fertile soil, while the two horses or chargers on each side represent dignity. The eagle represents strength, while the green and white bands on the top of the shield represent the rich soil.

Question: black shield in nigeria coat of arm represent what?
The relevant information to answer the above question is: The black shield represents Nigeria's fertile soil, while the two horses or chargers on each side represent dignity.
The answer: Nigeria 's fertile soil.