I'm familiar with Latin, but it doesn't look like any Latin I've ever seen.

Let's presume that the mark is significant. After all, the missing chair seemed insignificant until it was used to block the bathroom door. The missing piano wire was likely used to help close a door or keep the doors from locking behind them. I'm not sure which - I'd have to try and see if either were possible. Had anyone else tried?

[ She pauses as a thought occurs to her. ]

Could it be a musical symbol? Or part of one? We haven't found the piano wire yet. Maybe the killer has some sort of obsession with music?