'Giles' nuts are easily identified in the field by an interesting characteristic not shared by other cultivars. 'Giles' nuts are often crooked. In the photo above, notice that the apex of the nut points to the right. In fact, the whole right side of the nut appears shorter than the left side. Crack the nut open and you'll find one kernel half shorter than the other (photo above).
Although every 'Giles' nut on a tree may not be "crooked", the vast majority display this characteristic to some degree. Crooked nuts are not the result of disease or improper fertilization, asymmetrical nut development is controlled genetically. This simple quirk of nature makes 'Giles' one of the easiest cultivars to identify from a nut sample.