The kanji character 栓 (sen) primarily represents a "plug," "cork," or "stopper." It signifies something used to close or seal an opening to prevent the passage of fluids or gases. This core meaning is central to understanding its various applications.

・On-yomi (音読み): セン (sen) ・Kun-yomi (訓読み): 栓栓 (sen - as a standalone word)

⚫︎ 栓栓抜き Translation: Bottle opener (literally "plug remover") ⚫︎ 安全栓栓 Translation: Safety plug/stopper ⚫︎ ガス栓栓 Translation: Gas valve (literally "gas plug")

The kanji 栓栓 is a phono-semantic compound (形声文字, けいせいもじ). The semantic component is 木 (ki) which means "tree" or "wood," and it provides a clue to the meaning of the character: the plug is generally made of wood. The phonetic component is 全 (zen), which indicates the sound (sen). Thus, the character combines the idea of wood (the material) with a phonetic element to suggest how to pronounce it, and the concept of something that plugs/seals.