This chapter seeks to provide an in-depth knowledge of projections of knots and links in a time period where they form a distinct part of the contemporary art. In medieval Europe, these motifs are widely used in artifacts such as stone monuments, churches, furniture, illuminated manuscripts, and smaller decorative items. This chapter provides an overview of knotwork within medieval material culture, emphasizing its dual role as a decorative art form and as an expression bearer for religious and social values. By analyzing examples from diverse artifacts, the research identifies similarities as well as key regional variations in knotwork patterns. Additionally, the mathematical principles underlying these designs, including symmetry, geometrical composition, and proportionality, are examined to reveal the technical expertise and innovation of medieval artisans. This chapter highlights how simpler, symmetrical knotwork motifs persisted alongside more elaborate designs, reflecting cross-cultural exchanges and evolving artistic practices. This contributes to a broader understanding of the role of knotwork in shaping medieval artistic traditions and underscores its enduring influence as a symbol of cultural expression.