I am no scholar on the subject, but I have faith in the many mason on this board to correct me when I get a bit wrong.
Okay numbers,
3 = 3 degrees of Freemasonry , Entered Apprentice, Fellow Craft, Master Mason.
5 = only reference I know of is regarding 5 steps, but that is part of one of the rituals so I don't know how much some one is allowed to post, and I
have never asked any more.
7 = The Seven Sciences, I'd ask a Fully fledged mason to detail them for you if you want to know them.
I have not actually seen any direect link to a pyramid with Freemasonry, the Illuminati yes, and I know people link the two, but I understand it that
the Illuminati infiltrated European freemasonry to help recruitment processes or something. Which therefore would create a problem with the
illuminati and not Freemasonry.
I have seen a lot of diagrams showing the street maps of Washington, depicting a pentagram. The only star I know involved with Freemasonry is the
star of David, the six pointed one so I don't see the relevance of that bit.
Are there any of the symbols in particular you want to know about. As with a Christian and the crucifix, the symbols hold personal meaning to each
individual mason, but there is also a fraternal meaning to them all.
Alot of the problem especially with the street map views etc is people blame freemasonry for the lot due to supposed linkage. You can definetly make
a pentagram, slightly skewif, but you can see it. people blame freemasonry because they have linked freemasonry with the occult. Don't shout about
the occult building Washington though, just freemasonry.
They can make a square and compass by joining three buildings/monuments with two line and make the square part by just drawing the lines, they don't
seem to point to anything of significance, don't forget I am not American so they might be

. The square bit is the downward arrow shape incase
you don't know.