Baal is a masculine noun, often used to denote a lord or master, and in this context, it refers to a deity worshiped by the Arameans.
Cultural context
Baal was a common name for gods in the ancient Near East, often associated with fertility and storms. The Arameans believed their gods were limited to certain territories.
Theological significance
The mention of Baal highlights the conflict between the worship of Yahweh and the pagan deities, emphasizing Yahweh's supremacy over all gods and territories.