OVIVO

This is the third and final symbol you pick up in the first level (not the introductory level!). While it is missable, it's also incredibly hard to actually miss as it's along the main path. From the second symbol (for Only symbols remained), you'll pick up 5 Morse dots along the way to this one (these are needed for The story is written), with the 5th one actually being right next to the symbol.
 

Collect the symbol to unlock the trophy.