"You can spot the Americans because they refer to personal data as PII"
From that well-known American site ico.gov.uk and its definition of personal data within the meaning of the forthcoming DPA:
"Personal data means data which relate to a living individual who can be identified"
PID would be a handy abbreviation. Unfortunately, that TLA has long established usage elsewhere so let's substitute Information for Data. PII it is, whichever side of the pond you're on.