I found it especially interesting because a similar shape appears under the "Csssiopeia" nymph.

Are you sure that it's a flail David?

Looks like grapes to me, fitting for the time of year

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Helmut is right. Each illustration includes the zodiac sign and a labor of the month.
Great Scorpio by the way
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[PS: aren't we off-topic?]

Quote: Are you sure that it's a flail David? 

Not at all, it was an off the cuff comment without due care and consideration I'm afraid
Just reminded me of some of the pictures of Justita I've seen, with scales in one hand and a weapon in the other.