The term "Young's Modulus" is used instead of "Young's coefficient" because it reflects the relationship between stress and strain in materials, indicating a material's ability to deform elastically. In engineering, a modulus typically refers to a ratio involving dimensions, while a coefficient is often dimensionless. This distinction highlights that Young's Modulus quantifies how much a material will stretch or compress under a given load, making it a critical parameter in material science. The discussion emphasizes the importance of terminology in accurately describing physical properties. Understanding these differences is essential for proper application in engineering contexts.