Portuguese Ceres Question

I am translating a Comparative Philately document about the Portuguese Ceres and part of the text says (my translation):
She wears a Phrygian cap over a tunic that shows to best advantage the five squares on the chest.

Nowhere in the document are "the five squares" explained leaving me with the impression that it is something of common knowledge. Yet, I can't seem to find any other reference to it in any of my encyclopedias or catalogues.

Any ideas? Thanks in advance.

Just a calculated guess Tony.

The 5 bezants or escutheons are shown consistantly on
Portuguese stamps.

The 5 "bezants" (or coins) (byzantium) originally signified
the ruler could issue coins as the head of a sovereign state.
Sometime later these were changed to escutcheons.
wiki
Escutcheons and bezants
After the official recognition of the Kingdom of Portugal as an independent country in 1143 (it had been declared in 1139), silver bezants were added to the Burgundian flag, symbolising coins and the right the monarch had to issue currency, as leader of a sovereign state. Eventually, and given the enormous dynamism of medieval heraldry, it is believed that the shield degraded and lost some elements in battle, eventually losing the cross format. This is how King Sancho I inherited the shield from his father, Afonso Henriques, with no cross and five escutcheons (known in Portuguese as quinas), which stood where the silver bezants had been placed.

Later, the number of silver bezants in each escutcheon would be reduced from eleven to five by King Sebastian I, and modern explanations interpret them as the five wounds of Jesus Christ, although this is highly improbable.

Thanks Rod.
I somehow had an idea that the answer was staring me in the face.
Old age again, I'm afraid.
In my Portuguese Encarta the five dots (pontos, in my document) are referred to as escudos which could be 'coins', round, as in your flag, and also 'shields', square, as in Constantino Fernandes's design of the Ceres stamp. For some reason I didn't put two and two together. Just tired, I guess.

Thanks again.

Hey, no problem Tony,
jeepers, we all experience that from time to time.
How many times have I burnt my toast?

The good thing is we all learn, and it's good fun,
I have been meaning to find the significance of the
linked chains on the shield of Spain/Belgium? for over 5 years.
One day I'll get around to it.