Castell, Human Tower, Catalonia, Spain

- The word agulla ("needle") refers to a high column of one person per level which is built inside the main tower. When the castell is being dismantled, the agulla must remain standing until the outside part of the castell is already down.
- Another aspect of castell nomenclature refers to how successfully the tower was completed. Three terms are used:
- Descarregat : the tower was completed to the top and successfully dismantled
- Carregat : the tower was completed to the top, but fell during dismantling