Question: What typical textbook symbol for the complement of a set will Maple accept?

I can define a discrete, finite universal set U, say the digits 1-5.


I can define a subset such as


Maple will compute the complement


but I cannot find any common textbook way of naming that complement that Maple will accept.  I cannot use a superscript c.  I cannot use a prime.  I cannot use an apostrophe.  I cannot use an overbar. Yes, I can type any of those using the various symbol pallets, but everyone leads to an error message.  Yes, I can use an unrelated symbol


but that hides the fact that I now have the complement of X in succeeding statements.


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