Sampi (uppercase/lowercase Ϡ ϡ) is a letter for the number "900" used in the system of Greek numerals. Before that, it was a letter that was used in the Greek alphabet in a few Greek cities in the 5th century BC. At that time, it looked like or . It was probably pronounced like "ts" or "tch" in the dialect of those cities. Over time, it was changed from to or and at last to .