What do the abbreviations on blood test results mean?

Could you please explain, in a clear and concise manner, the significance of the various abbreviations that are commonly found on blood test results? For instance, what does WBC stand for and what does it signify in relation to one's health? Similarly, could you elaborate on the meaning of abbreviations such as RBC, Hb, HCT, MCV, MCH, and MCHC, and how they relate to various aspects of blood composition and function? Understanding these abbreviations and their corresponding interpretations is crucial for patients to accurately comprehend their blood test results and make informed decisions about their health.