Here's another of my random bio+heraldry posts, in High-res only on my Patreon!
This is the first such post to feature a different sort of heraldry - the halfblood house seals:
As per ancient heraldic tradition, halfbloods are not allowed to possess heraldry. In its place they developed the use of the household sigil, which emerged from their use of signet rings to identify themselves in correspondence. While not technically heraldry, it has, over the centuries, developed its own tradition and symbolism almost as rich as that of heraldry itself.
Originating from the otherworldly alphabet, these sigils have since become corrupted into a half-forgotten symbolic representation of the house strength (and sometimes weaknesses), though such symbolism is often at odds with that of common heraldic languages.