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.
History of Cow Appreciation Day Alright, itâs a fun story, but ultimately Cow Appreciation Day was the clever brainchild of the Chik-Fil-A company, creating the story of the daring cow to encourage people to skip their favorite burger joint, and come to their local Chik-Fil-A instead.