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.
For several years now others and myself have worked to have September 27th designated as National First Responder Appreciation Day. September 27th represents another day where first responders from all branches to save innocent lives. At this point, 22 states have designated September 27th as First Responder Appreciation Day. I ask that congress and the president join us and designate an official national day day, which honors those who serve.