This is an index as it clearly says 'no entry'. If it was a sign without words, it would be an icon. This is important because if you go somewhere that you aren't allowed to enter, it could result into you getting into a lot of trouble or even danger.
This is an icon. the majority of the society would recognise this icon anywhere and they would know that it is the icon that represents instagram, a popular social media application.
This is a symbol. although it doesn't immediately imply anything, people know that this is a sign for disabled people. It may mean that there is disabled access.
Icons and indexes are important because they portray a message for us to understand. Everyone is able to understand them because the image or word clearly implies that its about a specific topic or object.
Global brands may avoid using symbols when advertising and marketing as some symbols don't mean the same in other countries because they may be cultural that only the local society understand. It could offend people around the world.
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