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Holographs
From Warhammer 40k - Lexicanum
A Holographs (also - Holographis lasers or sky-writers) used to project pictures or words onto a cloud cover, that can be seen by all troops. Holographs used to declining enemy morale, reminding about past defeats, promising comfort for deserters etc.[1]
Source
- 1: Warhammer 40,000: Rogue Trader. pg. 98