3

3 is the set number for seven LEGO sets. It could refer to any one of the following:
3-Velveeta Promotional Set No 3.jpg|3 Velveeta Promotional Set No 3
3 Life Cereal Promotional.gif|3 Life Cereal Promotional
3-Mini-Wheel Model Maker No. 3.gif|3 Mini-Wheel Model Maker No. 3
3-Battery Box.jpg|3 Battery Box
3-Basic Set.jpg|3 Basic Set
3-Doors and Fences.gif|3 Doors & Fences
3-Medium House Set.jpg|3 Medium House Set