Segno has the symbol 𝄋 and Coda has the symbol 𝄌. Ok, barely visible, but I thought it was funny that unicode symbols for these actually exist.
But as far as I know, there are no symbols for D.C., D.S., D.C. al Coda and such. Is this true? If so, is there a historic or maybe even a good reason for this? And why aren't they shortened even more? "D.C. al Coda" and "D.C. al Fine" could be just "D.C.C" and "D.C.F."
I would understand it for things that are fairly rare, but these constructs exist in almost all arrangements.