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.
Aug26 Fun Holiday â Dog Appreciation Day. August 26 is Dog Day or Dog Appreciation Day, a day to appreciate your best friend on four legs. Happy young boy lovingly hugging his pet dog. Give your furry friend a big hug and their favorite treat. Â©iStockphoto.com/MelleVaroy.