What are these symbols on the wall in New Mombasa?

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First time playing Halo 3 ODST -- there are these weird symbols all over the walls in New Mombasa whenever I activate night vision. Without night vision on they fade away or don't show up at all. I'm wondering if this is related to any secret areas or is it supposed to indicate something important?
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What do the symbols in Halo mean?
A glowing light that circles something, like the moon or a person's head is a halo. Painters of religious art often put a halo around the heads of angels and saints. A halo is a symbol of holiness, represented by a circle or arc of light around the head of a saint or holy person.Where are the beacons in ODST?
BeaconsLocationObjectLevelSector 4, building overlooking Kizingo BoulevardDestroyed Gauss TurretKizingo BoulevardSector 10, near destroyed bridge to ONI Alpha SiteRemote DetonatorONI Alpha SiteSector 3, hanging from a power lineSniper RifleNMPD HQSector 0, entrance to Kikowani StationBiofoam CanisterKikowani Station2 more rows•Mar 23, 2022Is Odst open world?
Halo 3: ODST is a shooter video game with most gameplay taking place from a first-person perspective. The game features an open world environment in the updated Kenyan city of Mombasa, referred to as New Mombasa.Halo 2 Anniversary Cutscenes - \
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