The author was referring to the steam holiday gems. They are a new feature (released yesterday) in which a steam user can turn their extra junk cards/backgrounds/emotes into gems.. These gems can be used to buy more cards; or, during the upcoming holiday event only, to bid on games.
Acinar cells. 1  Acinar cells are the exocrine (exo=outward) cells of the pancreas that produce and transport enzymes that are passed into the duodenum where they assist in the digestion of food.
In the image of equine pancreas below, one fairly-good cross section through an acinus is circled; note the wedge-shapped cells arranged around a small lumen: Pancreatic Ducts Digestive enzymes from acinar cells ultimately are delivered into the duodenum.