Only thing that comes to mind is Hot Rolled Steel.
HRs
The symbol for Harris Corporation in the NYSE is: HRS.
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Paper does not have its own chemical symbol but it is basically cellulose
The shortend form for minutes is mins :)
Hours/minutes/seconds = hrs/min/sec Degrees/minutes/seconds = o/"/' Actually, this should be o/'/"
Magnesium is an element, and has the symbol Mg on the Periodic Table.
organic peroxides
The skull with crossed bones is an ancient symbol of danger. In modern times, it has come to represent a warning that a material is a poison.
indicates the type of material where book is located
Explosives, Hazard Class 1