To me, the Rule of Three explains an awful lot of what's happening in the highly competitive smartphone market. So, the next question is "what can the Rule of Three tell us about the tablet market"?

Benzinga answers the question “what is the 3 day rule” with regards to stocks, how this rule helps investors and what you need to know.

What is the Celebrity 'Rule of 3'? The celebrity “rule of three” refers to a theory that celebrities die in threes at times close to each other.

The rule of three is based on this assumption. It''s very helpful to orators who can focus their speech on three issues. <br /><br />Further, each issue can be sub-divided into three sub-issues.