Tip on explaining what ghost orbs are to newbies

[SiEgE]

In the main lobby, there are many ghost orbs flying around(which many people usually take for dust particles). If you want to explain your newbie teammate what does the ghost orb look like - you can always use those particles as a direct example.

[Aquarius]

Another tip: they look like green laser pointer dots.

[KippenKaasBaas]

Or just tell them to look for a firefly flying around.

[SiEgE]

But when you can pinpoint the kind of animation to look for - that would be way more accurate.
"firefly" might suggest bigger light range, and laser pointer dot might suggest it should be fast, as the real ghost orb might be mistaken for a FX for dust particle.