Veil of tears
From A Wiki of Ice and Fire
Veil of tears can be an expressive way of referring to the living world. For example, in Westeros saying that someone has “passed from this veil of tears” means that that person has died.
Rhaenyra Targaryen, the Realm's Delight and Half-Year Queen, passed from this veil of tears upon the twenty-second day of tenth moon of the 130th year after Aegon's Conquest. —Archmaester Gyldayn