Radiate (coin)

The radiate or Post-reform radiate (the Latin name, like many Roman coins of this time, is unknown), was a Roman coin introduced by Diocletian during his reforms. The radiate looked very similar to the Antoninianus, with a radiate crown like Sol Invictus, apart from the absence of the "XXI" marking that numismatists believe indicated that the coin contained 20 parts bronze to 1 part silver. The radiate had little or no silver content. The weight varies between 2.23 and 3.44 grams.

On known radiates there is only one image: Jupiter presents Victory on a globe to Diocletian (Wildwinds), with the mintmark between the human images

There are also known radiates of Maximian, Constantius I, and Galerius, Diocletian's co-rulers, in the same style.

...
Wikipedia