On these Arcadius coins it is a closed hand holding a wreath, but there is an earlier type on posthumous coins of Constantine that depict the hand of God reaching down to Constantine in a quadriga.

Constantine I
Posthumous issue
A.D. 337- 340
15x16mm 2.8gm
DV CONSTANTINVS PT AVGG; Veiled head right.
Rev: Emperor, veiled to right in quadriga; the hand of God reaches down to him; star in upper right field.
In ex. SMANB
RIC VIII Antioch 37
Eusebius wrote about these coins shortly after the death of Constantine in A.D. 337 -- "At the same time coins were struck portraying the Blessed One on the obverse in the form of one with head veiled, on the reverse like a charioteer on a quadriga, being taken up by a right hand stretched out to him from above." Life of Constantine IV 73