Two thirds of a shekel — a word nobody could translate until the weights were dug up.
Mass
7.33–7.67 g (0.259–0.27 oz).
Defined as 2/3 of a shekel.
Reckoned from inscribed pim weights from Judean excavations.
The pim is the best small illustration of what archaeology does for the text. The word appears once, in a verse about Philistine smiths charging Israelites to sharpen their tools, and for centuries nobody knew what it meant; translators guessed, and the King James renders the line so loosely that the unit disappears. Then inscribed stone weights marked pim began coming out of Judean excavations, all weighing about two thirds of a shekel. The verse turned out to be a plain price, and a Philistine monopoly priced in it.
Silver was weighed, not counted, until coins reached Judah, so each weight is drawn as the cube that much silver makes. A shekel is about a centimetre across; the thirty pieces of silver would sit in a palm; a talent is a block a hand and a half wide.