diff --git a/pina/span.py b/pina/cartesian.py
similarity index 99%
rename from pina/span.py
rename to pina/cartesian.py
index 55066d4..1284428 100644
--- a/pina/span.py
+++ b/pina/cartesian.py
@@ -6,7 +6,7 @@ from .label_tensor import LabelTensor
 from .utils import torch_lhs
 
 
-class Span(Location):
+class CartesianDomain(Location):
     """PINA implementation of Hypercube domain."""
 
     def __init__(self, span_dict):