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.
1 February 15 - Annoy Squidward Day- A day SpongeBob and Patrick annoy Squidward more than normal. 2  June 8- Best Friends Day- A day meant to honor best friends.  March 8 - The Bikini Bottom Annual Free Day - A day when all products are free, or as thought to be by Mr. Krabs.