An ordinary is an area of tincture that covers a large part of the shield. Ordinaries drawn with thinner lines are referred to as diminutives. As a rule of thumb, an ordinary should cover 1/3 of the area of the shield. Smaller geometric shapes are often called subordinaries.
Types of Ordinaries
Cotising and Fimbriation
As ordinaries and sub-ordinaries are simple charges they may be cotised, fimbriated or voided, so long as they are not peripheral ordinaries (such as a bordure or chief).