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.
Tim Gregg with Sherry Morefield Gregg at Colorado State Capitol. April 1 Â· Denver, CO Â·. On the floor of the Colorado Senate for the vote designating September 27th as First Responder Appreciation Day in Colorado.