Can Finish mark be defined for a long profile using reference letters and between symbol.

[Sujit_pawar]

Can Finish mark be defined for a long complicated and continuous profile using reference letters and a between symbol.( A ↔ B)

 

[506818]

I don't see why not. However, it's best to have a defined area as it can be unclear where 'A' or 'B' starts assuming an uninterrupted profile.