9. The OR table and symbol

It is useful to list all the possible inputs the OR rule can have so you see all the possible outputs.

For the OR rule, the table below shows the four possible inputs and the resulting output

This is the table for the OR rule using the two binary numbers 1 and 0 to represent True and False. This kind of table is known as a 'Truth Table'

Symbol

This is how an OR rule is shown as a symbol

The OR rule uses two inputs and gives you one output.