index - a numerical scale used to compare variables with one another or with some reference number. 1  margin of error, margin of safety, safety margin - the margin required in order to insure safety; in engineering the margin of safety is the strength of the material minus the anticipated stress.
Nutty Ways to Celebrate Squirrel Appreciation Day This Year. SQUIRRELS! Whether you love them or loathe them, National Squirrel Appreciation Day, January 21st, is a great time to take a few moments and learn about these nutty animals. If you count flying squirrels we have 10 tree species in North America.
Customer Appreciation Day. March 5, 2017. Come enjoy all the play with none of the pay during Customer Appreciation Day as our way of thanking you with no admission fees all day and bonus activities. Customer Appreciation Day could also be your lucky day! While in many of our parks, visitors can register for a chance to win a Gold Pass Membership.