His Chinese codename literally means "twilight" or "dusk" (not to be confused with Dusk from Yan). On the other hand, his English codename refers to Shalim, the Cannanite god of dusk.
Nevertheless, his name actually refers to Salome in the New Testament, especially the eponymous play by Oscar Wilde. This is further confirmed by two nodes:
In The Fruition outfit, the sculpture behind him features Salome performing the Dance of the Seven Veils and holding the head of John the Baptist in a plate, and such scene is the climax of the eponymous play.
Shalem has the traits of a Mexican black kingsnake (Lampropeltis getula nigrita), which is noted by the coloration and the glossy scales of his tail.
The face on his shield is likely inspired by the Gorgoneion, which is based on Medusa in Greek mythology.
Before the Under Tides Rerun update in the CN server, Shalem's Elite 2 icon reuses his base icon. The Global server retroactively applied this when Phantom & Crimson Solitaire is released.
Shalem is the first Operator whose English/Korean CV is credited when he is revealed in the Global server's Twitter; his EN/KR dialogues had been added to CN alongside Dorothy's Vision, which precedes Crimson Solitaire's release in Global by nine days.
Shalem's Korean voice actor, Kim Myeong-jun, is a former musical actor, which fits the fact that Shalem himself was involved in a theatrical troupe.
