Phi is also used as a symbol for the Golden Ratio and on other occasions in math and science. This use is separately encoded as the Unicode glyph ϕ. The Fibonacci sequence, provides yet another way to derive Phi mathematically.
The Fibonacci spiral gets closer and closer to a Golden Spiral as it increases in size because of the ratio of each number in the Fibonacci series to the one before it converges on Phi, 1.618, as the series progresses. Beginning with Zero, then 1, it then moves on to the next number, as such: 0+1=1, 1+1=2, 2+1=3, 3+2=5, 5+3=8 and so forth. When we apply this mathematical formula to quantify or measure the movement of energy or Consciousness within time or space, the fibonacci spiral loses its connection going back to the Zero Point or Source, instead the sequence uses the previous number to add into itself to get to the next higher number of the sequence. In this mathematical program it has no center connection to return to, so it attaches to another living thing or consumes what is in its path in order to grow and expand.