The kanji 紺紺 primarily represents the color navy blue, or a dark blue color. It refers to a deep, rich shade of blue often associated with the sea or a deep, dark sky. The meaning extends to include things that are the color navy blue, such as clothing or other items.

・On-yomi (音読み): コン (kon) ・Kun-yomi (訓読み): None, but often used in the compound 紺色 (kon-iro), meaning navy blue

⚫︎ 紺色の服を着ています。 Translation: I am wearing navy blue clothes. ⚫︎ 紺色のネクタイ Translation: Navy blue tie. ⚫︎ 紺碧の海 Translation: Azure sea (literally "navy blue and azure sea")

The kanji 紺紺 is a 形声文字 (keisei moji), or a phono-semantic compound. The left side is a part related to silk (糸 - ito), and the right side 　（工 - kou) indicates the sound. The original meaning relates to the dark blue color that resulted from dyeing silk. This character thus combines the visual aspect of the color (silk) with a phonetic component, giving the resulting word its "navy blue" meaning.