In wider vessels, erythrocytes may stack like a roll of coins. What is this stack called?

1. Erythrocytes are biconcave discs, so their flat faces can lie against one another. 2. In wider vessels they stack up much like a roll of coins. 3. That stack is called a rouleaux, from the French word for a roll. 4. A thrombus and an embolus are clot structures, not a normal stacking of red cells. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.3 Erythrocytes_