Ion in text usually means I don’t. It’s casual slang where the “d” in don’t is dropped, making it quicker and easier to type in conversations. People commonly use it in informal chats, social media posts, or messages like Ion know (I don’t know), “Ion like that” (I don’t like that), or Ion care (I don’t care). The meaning depends on context, but in everyday texting, it almost always stands for I don’t, not the scientific term.