If the person makes financial transactions regularly, they should know the term. I have no idea what percentage of the population know it, but it's not that common a term- Corpus of Contemporary American English (COCA) has a database of 450 million words and just 418 examples. In newspapers, for instance, I only see the word used in the business/financial pages, and not that frequently. I had not heard of this site and I have never used this system.
Student or Learner