perhaps another name for Khetam, or “fortress”

a place on the Shur or great wall of Egypt, which extended from the Mediterranean to the Gulf of Suez

Here the Israelites made their third encampment (Exodus 13:20; Numbers 33:6). The camp was probably a little to the west of the modern town of Ismailia. Here the Israelites were commanded to change their route (Exodus 14:2), and “turn” towards the south, and encamp before Pi-hahiroth. (See EXODUS; PITHOM.)