Nebuly

From MiddleWiki

From the same root word as the word 'nebulous' meaning cloud-like, the nebuly division in heraldry is a stylized representation of clouds.

The Barony of the Cleftlands and the Shire of Gwyntarian both have arms that feature blue and white nebuly.

Pictured is the Barony of the Cleftlands device, The wavy line dividing the shield along the diagonal is nebuly.