Black December - period when usually scams big part of HYIPs (before the Christmas).
Calendar days - project what is paying profit 7 days per week.
Business days - also known as working days, project what is paying 5 days per week.
Long term program - program what pays small interest rate daily usually for more then 100 days. Sometimes such programs offers "principal back" feature in the end of investment term.
Short term program - program what pays for relatively short period of time, usually investment plans have included interest in daily payments, for 10 till 50 days.
After-one-day program - program what have investment plans what pays after one day, like 103% after one day where 3% of that is your profit.
Piggy bank program - program what allows you to withdraw your initial investment any time.