Answer Reversed Sign Letters: Reasons & Examples

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help! light question

List some situations where the letters on signs are reversed. Explain why it is being done.

I have no clue T.T... can anyone help me with this question please?...
 

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can anyone help me please..
 
where have you seen letters printed in reverse before?
 
ecnalubmA. Sorry, couldn't resist.
 

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