Those are the 'initials' imprinted on the elemental shards. Below the initials are a rank marking of some sort. The machinations you destroyed in the Burning Steppes were of 'Rank IV.' I assume that this is a lowly rank.
Take this shard sample to Lotwil Veriatus in the camp to the east. He is a scholar of some renown in the field of elemental sciences. He may be able to assist us in our search.