The lambdoid suture, also known as the lambda suture or lambda sign, is located at the back of the skull where the parietal bones meet the occipital bone. It resembles the Greek letter lambda (λ) and thus gets its name. There are various synonyms used for this cranial structure, including the occipitoparietal suture, the sagittal suture of the occipital bone, or the occipitomastoid suture. It is an important landmark for identifying certain medical conditions and for surgical procedures. Understanding the different names used for this structure can help medical professionals communicate effectively and efficiently when discussing cranial anatomy.