A Heraldic Primer: Arrangements

Arrangement refers to the placement of charges relative to other charges in a single grouping. If you have a group of three charges (billets, say) there are many standard ways in which they can be arranged:

Sable, in fess three billets argent.
Sable, three billets in pale argent.
Sable, three billets, two and one, argent.
Sable, three billets, one and two, argent.
Sable, in bend three billets palewise argent.
Sable, three billets palewise in bend sinister argent.

Note that the arrangement can appear in different positions in the blazon. Sometimes it appears before the number; sometimes it appears after the type. Both positions are legal for phrases that begin with the word "in". Phases consisting of lists of numbers should only appear after the type.

Note that it was necessary to specify the orientation of the billets when they were arranged "in bend" and "in bend sinister". This is because:

In many circumstances, there is a default arrangement. For instance, a group of three charges on the field are "two and one" if no other arrangement is specified.