5

5 is the set number for five LEGO sets. It could refer to any one of the following:
5-Basic Set.jpg|5 Basic Set
5-Large House Set.jpg|5 Large House Set
5-Hinges.jpg|5 Hinges
5-Treads.jpg|5 Treads
5 Velveeta Promotional Set No 5.png|5 Velveeta Promotional Set No 5