Dan Brown is doing his latest novel using some of this stuff. The symbols are interesting, and still hold occult data (the all-seeing eye, for example, symbolizes the “unity” of all consciousness), but to me a dollar is still worth the paper it’s printed on, about 12 cents.
Symbols are what you want them to be. During the 18th century and prior, when it was rare for the masses to be literate, symbols were used to convey meanings- and few of the meanings were 'occult' (hidden). In some cases, they were used by occultists and the like, but more often than not, they predated the occultic use. The pentagram, for example, is commonly seen as an occultic symbol, but is also used as a symbol of time (8 year cycle), spring, the direction East, etc..
Imagine a time when few were literate, yet messages had to be passed.