The word "栅栏" is formed by combining two characters, both meaning "fence" or "railing". The first character, "栅", consists of the wood radical "木" and the component "册", which resembles bamboo or wooden strips, indicating a structure made of such materials. The second character, "栏", also includes the wood radical "木" paired with "兰", which primarily provides phonetic guidance but aligns with barrier-related meanings. Together, they form a compound word where each character reinforces the semantic concept of a wooden fence.