Ornament - according to dictionary.com: an accessory, article, or detail used to beautify the appearance of something to which it is added or of which it is a part: architectural ornaments
-any adornment or means of adornment.
That time when Lord Commander Jeor Mormont have Jon Snow his family sword, Longclaw, but change the pommel from his house sigil of a bear to a direwolf.
The direwolf is a neat ornament on Longclaw!