Cox
Coke is a solid residue obtained as a result of distillation (or carbonization, or gasification) of bituminous coal, lignite, or peat in the absence of air access. It is produced in coke ovens from bituminous coals of various qualities.
Semi-coke is obtained as a result of distillation of bituminous coal or lignite at low temperatures
Source: "Explanations to the Commodity Nomenclature of Foreign Economic Activity of the Russian Federation (Russian Customs Tariff)" (prepared by the Federal Customs Service of the Russian Federation) (volume 1, sections I - VI, groups 1 - 29)