What do the heads of the seven Maitreya Buddhas mean?

Three-way Buddha head is an important part of Buddha beads. In addition to south red agate, the common materials are: amber, turquoise, lapis lazuli, tortoise shell, ox bone and so on. The three Buddha heads and beads represent the conversion to the three treasures. The Buddha's head represents Buddha and other beads, while the string is very particular. Generally, the heads of the three-way Buddha of South Red Agate are connected in series at the end of the whole string of beads of South Red Agate. Its size is larger than other beads in the south red agate beads, showing a "D" shape with holes on three sides. The rope passes through two through holes and then comes out from the middle hole, symbolizing "the unity of all laws".