In English-language heraldry, the fillet is considered a diminutive of the chief. It is defined as occupying one fourth the width of the chief and typically positioned at its bottom edge. When so positioned the chief is blazoned as supported by the fillet; but, when the chief is charged by the fillet, as when the fillet positioned at its top edge or middle, the chief is blazoned as surmounted. In French heraldry, terms for this charge are divise and filet en chef. The term chef retrait has also been used. The fillet or divise placed beneath the chief is of a different tincture than the field, evidently to avoid violations of the rule of tincture.

In heraldry, an ordinary is one of the two main types of charges, beside the mobile charges. An 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.