I'm not fluent in ancient Latin, but I've uh...stared blankly and squinted at it in hopes that it'd somehow magically make sense before. I don't remember a symbol like that, but again, not fluent.

I don't think we should be focusing that much on what it could mean though, it could be anything. Maybe she scribbled on her hand before she was killed because she wanted to make sure of what color it was, that's a thing girls do with make-up right? We should be asking two other things instead.

[He holds up a finger.] First of all, was Lydia the one who actually wrote it or was it the killer? If it was the killer, we're just wasting our time and playing right into their hands.

Secondly, if it was Lydia, then when did she get the chance to write it? If the killer knocked her out first before drowning her, she obviously wouldn't have been able to write anything. If they didn't, then why wasn't there any sign of a struggle anywhere or any marks on her body? The killer could have cleaned up the crime scene, but there should still be bruises or scratches or something on her. I doubt she was so focused on scribbling some weird symbol on her hand that she wouldn't have tried to fight back.