An example page from Handbook of Pictorial Symbols.
A second example page from Handbook of Pictorial Symbols.
Handbook of Pictorial Symbols - This book has over 3,250 examples of international symbols: a truly useful reference for designers.

This book is from the Dover Pictorial Archive Series, which means, according to the instructions on the copyright page:

You may use the designs and illustrations for graphics and crafts applications, free and without special permission, (excluding the symbols on pages 101 - 109 and the Olympic Sports symbols) provided that you include no more than ten in the same publication or project. For any more extensive use, contact Dover Publications.
This book is 135 pages long, and is a generous 8 1/2 by 11 inch, indexed, paperbound book by Dover that retails for under $20 - click the "order" link below to see what Amazon's current price is for this title.

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