To mathematicians and financial types, numbers probably seem pretty straightforward. You enter digits into an Excel document or formula and presto, get a predictable result. At least I think that’s the case, having barely exceeded the minimum SAT Math section score.

But have you ever noticed how numbers can take on a life of their own? For example, calendars might casually proclaim today to be 9-02-10. But remove the hyphens and you’ve got the zip code made popular by the 1990’s teen drama starring actors pushing thirty years old. Astrologers make predictions about your love life and career based on your birthday.  Numbers on a lottery ticket can make you instantly rich, or at least inspire daydreams about an easier life.

My favorite number is three. The eldest of three siblings, I’m working on my third career. Finally, in my third significant relationship, I’m with a wonderful man who is truly a keeper.  I’m also partial to the number ten – which is the amount of years my friend Kim has been in remission from breast cancer and 40, the age at which I started valuing my own opinions over how other people thought I should live my life.

Aside from that burst of Hallmark card-worthy happiness, numbers can also be a downer. Like when you jump on a scale and don’t like the results or get a cholesterol score that makes you nervous. The difference of a second or two for elite athletes in competition can lead to a rush of elation or dashed hopes.

What numbers are most meaningful to you and why?