pH is an abbreviation for “power of hydrogen” where “p” is short for the German word for power (potenz), and H is the element symbol for hydrogen. Why a Danish scientist used a German word is Greek to me, but he was a scientist, and I’m not, so I’ll just go with the flow. The H is capitalized because it is standard to capitalize element symbols. So now you understand about as much as I do.
Your lawn loves low nitrogen (N), low phosphorus (P), and low potassium (K) fertilizer. It also likes organic fertilizer or urea-based fertilizers, not nitrate-based fertilizers. Why? Well, let’s look at the nature of lawns, especially warm-season grasses like St. Augustine, Bermuda, and Zoysia.