place name
陝 is a kanji used primarily as a place name, with no clear standalone conceptual meaning beyond that geographic reference.
陝 combines the mound radical ⻖ with 㚒, a component that likely contributed sound. The exact historical development is uncertain, but the character is associated with a place name in ancient China.
The left side ⻖ suggests a hill or mound, and the right side 㚒 looks like a person (大) with something tucked under each arm. Picture a distinctive landmark hill that marks a place: 陝 is that place name.
For セン, imagine a sign pointing to the place: the sign says 'Sen' in big letters, and you remember セン as the reading of this place-name kanji.