The word "ícono" can be written as 'esdrújula' or 'llana'.
What are some other words whose accentuation can vary?
The word "ícono" can be written as 'esdrújula' or 'llana'.
What are some other words whose accentuation can vary?
Since you seem to be only interested in knowing some words in the same situation as icono, here you have a couple of them:
1 See Is it "élite" or "elite"?
2 See video o vídeo in the Diccionario panhispánico de dudas