Otacilia Severa - Wife Of Philippus I

Otacilia Severa Antoninianus, just acquired from a friend.
Common type but fell in love with the nice portrait.

Weight 3,7 g
Diameter 23 mm

Could someone please explain to me the meaning of the crescent moon here?
An article from the NGC Collector´s society states:

"...In this case, the crescent represents the moon, and was meant to compliment the radiate crown atop her husband Philip's head on his portrait coinage."

Seems fair but... was this common usage? Does this come from eastern or western religion or myths? Is this somehow in some way related to the much later depictions of the virgin sitting on a crescent moon? Sorry for all the silly questions, I am not familiar with these.

Thank you very much!
Best

While you're drooling at the gorgeous coin above, here's my non-gorgeous one...



Had this so long (~5 years?) I completely forgot how I originally got it. Apparently I paid $8, or at least I said so in January 2017. If so, I suspect that it was bought at Aurora coin fair in late 2016, but could have been at Vernisage in the first full weekend of 2017.
(Vague memory: I had to take it out of an album, outdoors in winter, the album was cold and inflexible, and [yet another] small piece of the coin got snapped off. Might have confused it with another coin though.)

Has to be Otacilia Severa from obverse, but I dunno what the reverse type is, or if it's even identifiable at this stage. The portrait's not that bad, though, considering the state of the rest of it.

Similar to the sestertius posted earlier, but with an emerald and sandy patina.

244-249 Otacilia Severa Concordia Sestertius (Rome)

Obv: Bust of Otacilia Severa, diademed, draped, right. MARCIA OTACIL SEVERA AVG. Marcia Otacilia Severa Augusta. Marcia Otacilia Severa the venerable.
Rev: Concordia, draped, seated left, holding patera in right hand and double cornucopias in left hand. CONCORDIA AVGG S C. Concordia Duorum Augustorum. Senatus Consultum. Harmony of the two emperors. Decree of the Senate.

There are some amazing coins in this thread , and a wealth of information too.

The only one I have, and @coffeyce's example puts it to shame.

Splendid post, Irbguy! Well-written, well-supported (with images), and illuminating. Also quite timely, as I just recently added this Augusta to my collection.

I found this portrait to be slightly more representative of Otacilia than I prefer (as opposed to the more realistic), but still a very nice portrayal.
Obverse: MARCIA OTACIL SEVERA AVG. Draped bust with tiara. Reverse: PVDICITIA AVG. Pudicitia with sceptre and veil n. l. seated, in section SC. 14.52 grams
Struck around 245 AD, this sestertius had the kind of detail that I find appealing. Including the corroded reverse! She is an excellent pairing with her husband Phillip I.