These constants are dimensionless scaling factors.
GSL_CONST_NUM_YOTTA
GSL_CONST_NUM_ZETTA
GSL_CONST_NUM_EXA
GSL_CONST_NUM_PETA
GSL_CONST_NUM_TERA
GSL_CONST_NUM_GIGA
GSL_CONST_NUM_MEGA
GSL_CONST_NUM_KILO
GSL_CONST_NUM_MILLI
GSL_CONST_NUM_MICRO
GSL_CONST_NUM_NANO
GSL_CONST_NUM_PICO
GSL_CONST_NUM_FEMTO
GSL_CONST_NUM_ATTO
GSL_CONST_NUM_ZEPTO
GSL_CONST_NUM_YOCTO