What does Factor VIII mean in medical term?

Factor VIII means: Factor VIII is the eight-factor factor that controls blood coagulation and clotting. Hemophilia hemophilia A is caused by a lack of normal factor VIII.
(in Medical Dictionary)

What else does Factor VIII mean?

Long ago, it was known that the gene responsible for hemophilia classic is on the X
chromosome. The gene is passed to hemophiliac boys by female carriers. The normal female carriers have an additional X chromosome with a gene that makes factor VIII. One-half of the sons are at risk for hemophiliacs.
(in Medical Dictionary)

Since the hemophilia gene was found on the Xchromosome, it was inferred that Factor VIII’s normal gene was also on the same Xchromosome. Also known as the antihemophiliac factor VIII or the antihemophiliacglobulin, Factor VIII can also be called antihemophiliac factor.
(in Medical Dictionary)