the.com/principal
The boss of any room, financial or scholastic — never spelled with the rebellious E.
means The most important person or thing, or the original sum of money on which interest is calculated.
from From Latin principalis, meaning first in rank, via princeps — the one who takes first place. Same root that gives us prince and principle, the eternal homophone headache.
Memory hackThe principal is your pal, supposedly.
Money senseThe loan amount before interest piles on.
Not principleThat one is a rule, no pal.