Dextrose , also mentioned as glucose or grape sugar.
This is a monosaccharide,a simple sugar that is the yeast can consume into alcohol. Brewing sugardoes not provide flavors that can be associated with cider, which sugar can provide. Often used to bring up OG a little higher.
1kg increases OG by about 0.15 points and the alcohol content by about 2% at a rate of 23 litres.