seren

This is the title of the rulers of the Philistines, the people who settled the coastal plain of Canaan and became Israel's great rivals through the days of the judges and the early kings. The Philistines were organized as five allied cities (Gaza, Ashdod, Ashkelon, Gath, and Ekron), and each was headed by one of these rulers. The word is almost always plural and almost always followed by "of the Philistines," because it names them as a set: the five who ruled together.

What stands out is that they act as a council. They gather to decide what to do with the captured ark, they pay Delilah together to trap Samson, and they meet as a body to plan war against Israel. No one of them rules alone; they move as a group of five with roughly equal standing.

The word is used only for Philistine rulers, never for an Israelite leader or the ruler of any other nation. That fact, together with the Philistines' origins across the sea, has long led scholars to treat it as a foreign word the Philistines brought with them, possibly related to the Greek word for an absolute ruler. Because it is bound so tightly to this one people, no ordinary Hebrew word for a king or a prince quite matches it.

In one place the same spelling names something entirely different: a mechanical part. The description of the movable bronze stands Solomon made for the temple mentions their four wheels and the part on which the wheels turned, understood as the axles. This use has no connection to the Philistine rulers; it is a separate word that happens to look the same.

Because the word turns up only this once for such an object, its exact reference is not certain. Translators and lexicons settle on "axle" as the best fit for a part of a wheeled stand, but the precise piece it names cannot be pinned down from a single verse.