The Chinese word **栏杆 (lángān)**, meaning "railing" or "banister," is a compound noun formed through the combination of two semantically related characters: **栏 (lán)**, which originally meant a fence, enclosure, or a column in a ledger, and **杆 (gān/gǎn)**, which refers to a pole, rod, or staff. Together, they create a **coordinative compound**, where both elements contribute similar or complementary meanings to define the object—essentially, a structure composed of **poles or rods arranged as a fence or barrier**. This formation exemplifies a common pattern in Chinese word-formation where two nouns with related meanings are joined to specify a single, concrete object.