In October, I observed that the Chinese anti-ship ballistic missile was probably styled the DF-21 Delta, making it the fourth mod of the DF-21. (A journalist had referred to it as the DF-21 Charlie, which I think is just the plain vanilla conventionally-armed DF-21 variant).
Looks like I was right. A senior defense official dropped “DF-21 Delta” in a press briefing for Chinese Military Power:
SR. DEFENSE OFFICIAL: Longer-range capabilities could include conventional ballistic missiles, both the short-range ballistic missiles like the ones that are deployed opposite Taiwan, but also longer-range, like conventional medium-range ballistic missiles, which is something that they’re working on, as well as the DF-21D, which is an anti-ship ballistic missile that they’re working on. That’s based on a CSS-5 medium-range ballistic missile air frame. Those are the types of things that we would consider, you know, disruptive in terms of longer-range capabilities.