== Mathematical constants 
PI  << 3.141 592 653 59
E   << 2.718 281 828 46
PHI << 1.618 033 988 75
SQ2 << 1.414 213 562 37

π << PI
φ << PHI

== Physical constants 
PLANCK        CONSTANT << 6.626 070 04e-34
GRAVITATIONAL CONSTANT << 6.674 08e-10