For counting breadfruit they use _pona_, knot, as their unit, breadfruit usually being tied up in knots of four. _Takau_ now takes its third signification, 40, and becomes the base of their breadfruit system, so to speak. For some unknown reason the next unit, 400, is expressed by _tauau_, while _au_, which is the term that would regularly stand for that number, has, by a second duplication, come to signify 800. The next unit, _mano_, has in a similar manner been twisted out of its original sense, and in counting breadfruit is made to serve for 8000. In the northern, or Nukuhivan Islands, the decimal-quaternary system is more regular. It is in the counting of breadfruit only,[202] 4 breadfruits = 1 pona = 4. 10 pona = 1 toha = 40. 10 toha = 1 au = 400. 10 au = 1 mano = 4000. 10 mano = 1 tini = 40,000. 10 tini = 1 tufa = 400,000. 10 tufa = 1 pohi = 4,000,000. In the Hawaiian dialect this scale is, with slight modification, the universal scale, used not only in counting breadfruit, but any other objects as well. The result is a complete decimal-quaternary system, such as is found nowhere else in the world except in this and a few of the neighbouring dialects of the Pacific. This scale, which is almost identical with the Nukuhivan, is[203] 4 units = 1 ha or tauna = 4. 10 tauna = 1 tanaha = 40. 10 tanaha = 1 lau = 400. 10 lau = 1 mano = 4000. 10 mano = 1 tini = 40,000. 10 tini = 1 lehu = 400,000.