鍵 means 'key'

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Strokes : 17    Frequency: 1532   JLPT: N1    Usefulness: 5    Study set: 5-24    Grade: 8   Intermediate lesson: -    Beginner lesson: -   Begins 23 words   Used in 41 words   Used in 116 names   Not used as a component
Jōyō (常用)
   かぎ key; lock
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Find out about lock picking made easy! Learn to determine when 鍵 represents the key to a door, a piano key, the key on a computer keyboard, or the key to a problem. Discover how to say, “She locked her jewels in the safe,” “Remember to lock the door,” “The room was locked,” “The door locks automatically,” “the key to success,” and “He's the person who holds the key to this case.”
⿰   gold   build  
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In the most useful 10,000 words in Japanese, 鍵 is used 2 times, read 2 ways.
Across all words in Japanese, 鍵 is used 39 times, read 2 ways.
ケン : 12 words FIND ALL
keyboard (e.g. piano, computer)
(click the word to view an additional 2 forms, examples and links)
かぎ : 27 words FIND ALL
1. key
2. lock  (see also: )
(click the word to view an additional 3 forms, useful expressions, examples and links)
An additional 錠 less common words include 鍵 but the reading has not yet been categorized.
Henshall: Joy o' Kanji : 2002  Key to Kanji:

Cascading kanji view

ケン   かぎ key; lock   
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キン   コン   かね gold; money   
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ジン   ニン   ひと man   
オウ    king   
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イチ   イツ   ひと    ひと- one   
ド   ト   ground; earth   つち ground, earth, soil   
ケン   コン   た to be built   たてる to build   
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long stride
writing brush
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