Annulet (architecture)  Annulets, in architecture, are small square components in the Doric capital, under the quarter-round. They are also called fillets or listels. An annulet is also a narrow flat moulding, common in other parts of a column, "viz." the bases, as well as the capital. It is so called, because it encompasses the column round. In this sense, "annulet" is frequently used for baguette or little astragal.