Final answer:
Cyanosis is the sign that indicates the purplish or bluish discoloration of the cervix, vagina, and vulva due to increased vascular congestion.
Step-by-step explanation:
The purplish or bluish discoloration of the cervix, vagina, and vulva due to increased vascular congestion is called cyanosis. Cyanosis occurs when there is reduced oxygenation of blood, resulting in a bluish tint to the skin and mucous membranes. It is a sign of poor circulation or a lack of oxygen in the blood.