I think this is it, but I'm no expert...

Araldica [modifica]
Pezza o pezza araldica - Termine araldico indicante figure, divise in ordinarie ed onorevoli
Pezza onorevole - Termine araldico indicante figure formate da linee di partizione
Pezza ordinaria - Termine araldico indicante figure di second'ordine
http://it.wikipedia.org/wiki/Pezza

Ordinary (heraldry)


In heraldry, an ordinary (or honourable ordinary) is a simple geometrical figure, bounded by straight lines and running from side to side or top to bottom of the shield. There are also some geometric charges known as subordinaries, which have been given lesser status by some heraldic writers, though most have been in use as long as the traditional ordinaries. Diminutives of ordinaries and some subordinaries are charges of the same shape, though thinner. Most of the ordinaries are theoretically said to occupy one-third of the shield; but this is rarely observed in practice, except when the ordinary is the only charge (as in the coat of arms of Austria).

The terms ordinary and subordinary are somewhat controversial, as they have been applied arbitrarily and inconsistently among authors, and the use of these terms has been disparaged by some leading heraldic authorities.[1] In his Complete Guide to Heraldry (1909), Arthur Charles Fox-Davies asserted that the terms are likely inventions of heraldic writers and not of heralds,[2] arguing the "utter absurdity of the necessity for any [such] classification at all," and stating that the ordinaries and sub-ordinaries are, in his mind, "no more than first charges."[3]


Ordinaries



Ordinaries (sometimes called "honourable ordinaries") resemble partitions of the field, but are formally considered objects on the field. Though there is some debate as to exactly which geometrical charges—with straight edges and running from edge to edge of the shield—constitute ordinaries, certain ones are agreed on by everyone. Except for the chief they are central to the shield
http://en.wikipedia.org/wiki/Ordinary_(heraldry)#Ordinaries

Ordinaries and sub-ordinaries
Main article: Ordinary (heraldry)
Some heraldic writersa distinguish, albeit arbitrarily, between "honourable ordinaries" and "sub-ordinaries". While some authors hold that only nine charges are "honourable" ordinaries, exactly which ones fit into this category is a subject of constant disagreement. The remainder are often termed "sub-ordinaries", and narrower or smaller versions of the ordinaries are called diminutives. While the term "ordinaries" is generally recognised, so much dispute may be found among sources regarding which are "honourable" and which are relegated to the category of "sub-ordinaries" that indeed one of the leading authors in the field, Arthur Charles Fox-Davies (1871–1928), wrote at length on what he calls the "utter absurdity of the necessity for any [such] classification at all," stating that the ordinaries and sub-ordinaries are, in his mind, "no more than first charges."[2] Apparently ceding the point for the moment, Fox-Davies lists the generally agreed-upon "honourable ordinaries" as the bend, fess, pale, pile, chevron, cross, saltire and chief.[2] Woodcock sheds some light on the matter, stating that earlier writers such as Leigh, Holme and Guillim proposed that "honourable ordinaries" should occupy one-third of the field, while later writers such as Edmondson favoured one-fifth,
etc.

http://en.wikipedia.org/wiki/Ordinary_(heraldry)#Ordinaries