Door casing. Like window casing, door casing is traditionally installed as separate pieces. But unlike window casing, door casing, for obvious reasons, has no bottom stool or apron.
Though not absolutely a given, the door casing comes from the same family of trim profiles as the window casing. So where there is a Craftsman-style window trim, you'd expect to see a Craftsman-style door trim. Sometimes, especially in a sophisticated design, changing scale while keeping the profiles the same is a way of distinguishing door and window trim. For example, a large and tall door might deserve a larger and more robust trim than, say, a small specialty window.