Also see definition of "Bekah" in Word Study
half a shekel
Bekah [nave]
BEKAH, a half shekel, about 31 cents, Ex. 38:26.Bekah [ebd]
Both the name and its explanation, "a half shekel," are given in Ex. 38:26. The word properly means a "division," a "part." (R.V., "beka.")
Also see definition of "Bekah" in Word Study