Frontlets were signs or ornaments worn on the forehead. The biblical command to keep God’s words as frontlets was understood initially as a call to keep His commandments continually in view, but later came to be practiced literally through worn passages of the Law.
The term occurs in commands concerning the words, statutes, and precepts given to Israel. These commands emphasized continual remembrance and careful attention to God’s instruction.
After the return from Babylon, portions of the Law were written on parchment, rolled into cases, and worn on the arm or forehead. The forehead case contained four parchment strips placed in separate cells and was called a tephillah on the head.