The document discusses the brand identity prism, which describes a brand through six facets: physique, personality, culture, relationship, customer reflection, and self-image. These facets are interrelated and form the boundaries that define a brand's identity. The physique is the brand's tangible qualities and features. The personality is how the brand communicates its character. The culture encompasses the brand's underlying values and principles. The relationship facet applies especially to service brands. Customer reflection is how the brand builds an image of its target user. And self-image is how users develop an inner relationship with the brand.