| Pi | PII | |
| What is it? | A mathematical constant | A T.L.A. for Personally Identifying Information |
| More specifically? | The ratio of a circle’s circumference to it’s diameter. | Things like your social security number, credit card numbers, fingerprints and so on. |
| Also known as? | 3.14159265…,  |
P.I.I. |
| Uses? | Converting degrees to radians and vice versa, among other things. | Keeping track of customers and citizens, among other things. |
| Mis-uses? | None known | Identity theft, stalking |
| Special day? | Pi Day or March 14 (1:59am) | n.a. |
| Legislative considerations? | Indiana Bill #246 | California Online Privacy Protection Act (OPPA) of 2003 |
| Learn more? | Pi animated, List pf demos,Calculating Pi with frozen hot dogs. | Google & IP addresses as PII, FISMA 2007 Report, Stripping (or not?) PII. |
Tags: mathematics, pi, pii, privacy
