The word **尺码** is a compound noun formed by combining two morphemes: **尺** (chǐ), which originally means "ruler" or "foot" (a unit of length), and **码** (mǎ), meaning "yard" (another unit of length) or, more broadly, a numbered code. Together, they create a semantic compound where both characters contribute related meanings of measurement and numbering, resulting in the combined sense of "size," "dimensions," or "measurements," commonly used for items like shoes and clothing. The term thus logically represents a standardized system of sizing based on linear units.