Magnentius standard with unusual elements

[Victor]

The standard on the reverse of this coin has an interesting design not usually found on the pole. There are three round objects with four points coming out of each. I seem to remember seeing similar things on a few LRB's in the past, perhaps on VIRTVS EXERCIT types. These are probably just a different rendition of  "Phalera, which are sculpted discs which were awarded for various military exploits." Below is a Vetranio with a labarum which shows the circular phalera.

Magnentius
A.D. 350-3
21x22mm   4.8gm
DN MAGNENTIVS P F AVG; rosette-diademed, draped, cuirassed bust right.
FELICITAS REIPVBLICE; Emperor standing left holding Victory on globe in right hand and labarum.
In ex. RSLG
RIC VIII Lyons 112

[Victor]

the scale is not the same, but perhaps the objects on the Magnentius coin are the same or similar to this on a denarius of Caracalla (Rome 197)

[Victor]

here's a VIRTVS EXERCIT with a similar object (much more like an X) on the trophy of arms

Crispus
A.D. 320
18x19mm    2.7gm
CRISPVS NOB CAES; Helmeted and cuirassed bust right.
VIRTVS EXERCIT; trophy of arms with captive seated on either side.
in ex. STR
RIC VII Trier 261