This is the 5137th most frequent Catalan word.
aspa
"Cross" or "X-shaped mark."
In this sentence, 'aspa' refers to the blade of a fan.
L'aspa del ventilador està trencada.
The blade of the fan is broken.
Here, 'aspes' refers to the blades of a windmill.
El molí de vent té quatre aspes que giren constantment.
The windmill has four blades that spin constantly.
In this case, 'aspa' refers to a cross shape, often used in signage to denote prohibition.