If 365 d in a y stands for 365 days in a year, then what does 7 b on a m stand for?

itsalphaandomega --

I am confident that the answer to your quiz question is that "7 b on a
m" stands for "7 branches on a menorah."

Here is a link to a Google search that returns several hundred results
that support that conclusion:

"have OR has 7 OR seven branches" menorah
://www.google.com/search?num=100&hl=en&lr=&q=+%22+have+OR+has+7+OR+seven+branches%22+menorah


Search Strategy:

I used a "brute force" strategy that involved scanning the "B" section
of my dictionary for promising nouns (it really only took a few
minutes).  I then devised search terms that I could quickly use to go
down the list of 20+ such nouns to find the right one:

"have OR has 7 OR seven [enter the plural of the "B" noun here]"


I really think this is your answer, but if you have reason to doubt
it, please ask for clarification before rating the answer.


markj-ga

This looks fine to me.  Well done!

7 books/bottles/bibles on a mantlepiece?
i can think of anything that is 7 except days of the week.