If, like me, you find the subject of semiotics obscure and difficult to understand, then maybe this is the book for you. It is a large book, full of illustrations and examples. It starts with a summary of theories and schools of thought. This is the part of the subject that I find difficult to digest, but the book lays out the information in a way that makes it a pleasure to read. No densely packed text here.
There are also practical sections, including how to go about designing your own pictograms and icons. This is very useful and practical information, even including information on using grids in Adobe Illustrator. A small selection of subjects covered in the practical section are size, lighting, position and colours of signage.
Another very good thing about this book is the amount of examples and pages of actual pictograms and signage.