I use the keyboard viewer as a cheat sheet so I can guide myself in the horrible fields of OSX keymaps and I realised that pressing some keys will display a few keys in orange. What does that color indicate?
What does the orange keys mean in keyboard viewer
keyboardui
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Best Answer
Those keys in orange are so-called dead keys. It's a key that does not necessarily generate a complete character by itself but may modify the character generated by the key struck immediately after.
The usage of those dead keys in a text editor or in the Terminal is usually indicated by a yellowish background. You may then enter the main character you want to modify to finally get the desired one.
Not all combinations of a dead key and a normal key are used. Typing altn (=~) n will result in a 'ñ'. But altn (=~) t just gives '~t'.