Question: Why "local D" prints D not in italic

In the below I was looking for an explanation why D is not printed in italic whereas I does.

I

I

(1)

whattype(I)

complex(extended_numeric)

(2)

_local(I)

I

(3)

whattype(I)

symbol

(4)

D

D

(5)

whattype(D)

procedure

(6)

_local(D)

D

(7)

whattype(D)

symbol

(8)

NULL

After the local call D and I are both symbols but not printed the same way. Why is that?

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