Final answer:
The Scottish clan tartan pattern commonly used for socks and known for its diamond shape is called Argyle. Argyle is distinct from other tartan patterns with its use of vivid colors and distinctive diamond shapes highlighted by contrasting lines.
Step-by-step explanation:
The Scottish clan tartan pattern that is typically diamond-shaped and commonly found on socks is known as Argyle. This pattern has its roots in the tartan designs, which were originated in Scotland. The plentiful sheep that roamed the Scottish green grassy lands provided the wool necessary for spinning and dyeing it into multiple colors. Local weavers created unique plaid patterns that represented families or small towns, often used in heavy tartan wool clothing and blankets to combat the bitter cold. One of the patterns that grew popular beyond traditional plaids is the Argyle pattern, characterized by diamonds, zigzags, and stripes. It is often made with vividly colored yarns that are highlighted by a contrasting single strand of yarn, distinguishing it from other patterns like Black Watch, Royal Stewart, or MacLeod.