What does doubly degenerate mean in molecular orbitals?

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What does "doubly degenerate" mean, when discussing molecular orbitals?
 
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It means two (doubly) states has the same energy level.
 
I read that E (such as in Eg) means doubly degenerate and T (as in T2g) is triply degenerate and A (as in A2g) is singly degenerate. The first 2 I understand but what is singly degenerate? Isn't singly degenerate just a single orbital?
 

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