This book covers a lot of territory in 251 pages. The major entries cover 2 pages, though some of these have a subsidiary topic on those 2 pages. There are also about 15 2-page spreads of a dozen smaller entries such as Greek deities, ancient Egyptian symbols, serpents, mythological beasts, crosses, zodiac signs, tarot cards, etc. There are a lot of familiar symbols such as the ankh, lotus, medicine wheel, crescent moon, halo, hieroglyphs, and many others. There are also a lot that I've never heard of: Algol, or demon star; Intihuatana stone, Phaistos disk, Petelia tablet, Book of Raziel the Angel, and many others.
They are divided into chapters: The Natural World, The Divine World, Signs & Symbols, The Mystic World.
There's a 4-page index so you can search for specific items. There are lots of interesting images, and a list at the back as to who owns the images, though no other information is given there.
There are probably mistakes, things left out that should have been covered or at least touched on. Certainly the format can't allow for really extensive coverage of anything, but it's a start.
I really liked the book and will probably read it again sometime.