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
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The shortend form for minutes is mins :)
Hours/minutes/seconds = hrs/min/sec Degrees/minutes/seconds = o/"/' Actually, this should be o/'/"
A common symbol for an electromagnet in circuit diagrams is a coil of wire with a core material, such as iron, placed within the coil. The symbol typically includes a zigzag line to represent the wire coil and a straight line through the center to represent the core material.
UTC - 12 hrs., UTC - 11 hrs., UTC - 10 hrs., UTC - 9.5 hrs., UTC - 9 hrs., UTC - 8 hrs., UTC - 7 hrs., UTC - 6 hrs., UTC - 5 hrs., UTC - 4.5 hrs., UTC - 4 hrs., either UTC - 3.5 hrs. or UTC - 2.5 hrs., UTC - 3 hrs., UTC - 2 hrs., UTC - 1 hr., UTC, UTC + 1 hr., UTC + 2 hrs., UTC + 3 hrs., sometimes UTC + 3.5 hrs., UTC + 4 hrs., UTC + 4.5 hrs., UTC + 5 hrs., UTC + 5.5 hrs., UTC + 5.75 hrs., UTC + 6 hrs., UTC + 6.5 hrs., UTC + 7 hrs., UTC + 8 hrs., UTC + 8.75 hrs., UTC + 9 hrs., UTC + 9.5 hrs., UTC + 10 hrs., UTC + 10.5 hrs., UTC + 11 hrs., UTC + 11.5 hrs., UTC + 12 hrs., either UTC + 12.75 hrs. or UTC + 13.75 hrs., UTC + 13 hrs. and UTC + 14 hrs.
organic peroxides
The reluctance symbol is a measure of the opposition to magnetic flux in a magnetic circuit. It is represented by the symbol "R" and is the reciprocal of permeance, which is a measure of the ease with which magnetic flux is established in a material or circuit.
The symbol for permeability is μ (mu). It is used to represent the ability of a material to allow magnetic lines of force to pass through it.