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. The Spirit of Independence. Each July, we celebrate Customer Appreciation Day in conjunction with the celebration of our nationâs independence. While Customer Appreciation Day is just one day during the year, we strive to carry that same spirit with us each and every day.