Hard to believe, but one of the most ubiquitous terms of caution and vigilance, particularly when it comes to public safety and potential threats, was almost a throwaway. “If you See Something, Say Something,” was coined the day after the Sept. 11, 2001 terror attacks by late New York ad executive Allen Kay, who scribbled the phrase on a 3-by-5 index card. He was thinking about potential slogans for civic engagement in the wake of the attack and jotted the phrase down without any specific client or project in mind. Now, more than 20 years later, “See Something, Say Something,”…