rekhev

This is the standard word for the war chariot and, just as often, for chariots gathered into one striking arm of an army. Hebrew uses the same form for a single vehicle and for the whole massed force, so context decides whether one cart or a thousand is in view. Read alongside horses and riders, it usually means the chariot corps as a unit, the most feared mobile weapon of the ancient world.

Because that weapon was so dominant, the word carries a steady undertone in the Bible. Nations trust their chariots; Israel is told not to. The contrast between trusting chariots and trusting the LORD runs through the prophets and the Psalms, so the plain military term often does theological work.

The same word also names something the eye cannot count: the chariots of God, the fiery chariot that takes Elijah up, the heavenly forces around Elisha. When Elisha is hailed as the chariots of Israel, the point is that the nation's real defense was a man of God, not its armored vehicles.

In a few places the same spelling names a household object rather than a weapon: the upper millstone, the heavy turning stone that a woman worked over the fixed lower stone to grind grain into flour. The link to the chariot sense is only the underlying picture of something that rides or rolls on top of something else; the two are different objects, and a reader needs a different English word for each.

The upper stone mattered enough that the law forbade taking it, or the whole mill, as security for a debt: to seize it was to seize a household's daily bread. Its weight is also why it could be thrown from a wall as a crushing weapon in the story of Abimelech.