SnapBloks uses the following color coding to distinguish Inputs, Outputs, Connectivities, and Power Bloks. One more color coding is white to denote Bloks that are under development and testing.

Those symbols in the figure, from left to right and top to bottom, they are light, thermometer, wireless connection, battery, sound, and 3-axial accelerometer. Below you may find other SnapBloks' symbols.

Some of these symbols might not be easy to understand the meaning of it. So feel free to comment or suggest better symbols to represent sensors and actuators.