Probably sugar.
However, you ALWAYS measure 1:1 or 2:1 sugar syrups by WEIGHT, not volume.
1 pound of sugar + 1 pound of water (1 pint of water) =1:1
2 pounds of sugar + 1 pound of water (1 pint of water = 2:1

Quite often directions say "by volume or weight" but that refers to the
liquid, not the solid.  It just happens that 1 point of water weighs 1 pound.

Unless you are in the sunny south, this is November and you should be feeding
2:1
syrup now, because in cool weather, the bees can NOT evaporate the water out
of 1:1 syrup to store it.

1:1 is artificial nectar and is only used in warm weather or to stimulate
queen brood rearing

I hope I have helped.

George Imirie