The most common theory is that the sign must represent a castle or fortress. Although some say it is a four-leaf clover or a cloverleaf (highway junction). So we cannot say with certainty the origin. What we do know is that Susan Kare did not discover the symbol while on vacation. This is sometimes claimed, but as we mentioned earlier, Susan just

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This all goes back to the 15th-Century, when the word ‘brand’ itself was only used to refer to cattle, and books were just beginning to be “published” en masse. Printed pages were expensive, so well-to-do lords “branded” their books using custom-designed labels or stamps, also known as Ex Libris. (One of the earliest examples comes from a... See more