The triangular object on f76v

[Koen G]

Indeed Marco, looking at the figure again now two years later I must agree that grain is the most likely meaning of the attribute. It being held by a young woman would also suggest some relation to a Virgo figure, or some harvest goddess.

I maintain that the curls hanging from the triangle are likely references to such a woman's hairstyle. The manuscript image you posted has something similar. I like the fresco as well, good examples.