Datum is a noun that refers to a piece of information. 

Having been around the English language since the mid-18th century, our word of the day comes directly from the Latin word for ‘something given.’ It is the singular version of the commonly used plural word ‘data.’ Here’s an example:

While eating a hot dog at the company picnic, Harvey walked up to me and delivered this fun fact: The average hot dog contains approximately one rat hair each. I just thanked him for the datum and threw my plate in the trash can.