剣 is built from the 僉 (all / together (in 検·険)) and 刂 (knife (right)) components.
It belongs to a phonetic family with 検, 験, 険, and 倹 — they share the 僉 component and the reading ケン.
A common word using 剣 is 真剣 (しんけん), meaning “seriousness, earnestness”.
Don't confuse it with 険, 検, and 験.
