what does the greek letter Δ stand for?

Yup, it stands for delta, which by the way, in Greek (modern not ancient), is pronounced 'th'. As in 'this', or 'that'.

Stands for both change, or uncertainty. The symbol is used throughout science and ancient Greek philosophy.

DELTA: Delta (uppercase Δ, lowercase δ) is the fourth letter of the Greek alphabet. In the system of Greek numerals it has a value of 4. It was derived from the Phoenician letter Dalet . Letters that arose from Delta include the Latin D and the equivalent in the Cyrillic alphabet Д. In Modern Greek it represents a voiced dental fricative /ð/, (like the th in the English word this) but in the Ancient Greek language, it represented a voiced dental plosive [d]. A river delta is named after the letter delta because it has roughly the triangular shape of the upper-case delta.

Delta, don't know what it stands for tho.

I believe that one is delta. It also means "change in" in science.

stands for P

delta...