Smith's Bible Dictionary
Bells. In Exodus 28:33, the bells alluded to were the golden ones, 72 in number, round the hem of the priest's ephod. The object of them was so that "his sound might be heard." Exodus 28:34; Sirach 45:9. To this day, bells are frequently attached, for the sake of their pleasant sound, to the anklets of women. The little girls of Cairo wear strings of them around their feet. In Zechariah 14:20, "bells of the horses" were concave or flat pieces of brass, which were sometimes attached to horses for the sake of ornament.
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Smith, William, Dr. Entry for 'Bells'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/b/bells.html. 1901.