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r.h.
abbr.	Request Header (Vosoni); Response Header (Vosoni); right hand
insur.	Running hours
polym.	relative humidity; Rockwell hardness
r/h
abbr.	roentgens per hour
r-h
abbr., earth.sc.	radioactive halo
R.H.
abbr.	Royal Highness
abbr., commer.	railhead
abbr., earth.sc.	relative height
abbr., O&G, sakh.	right-hand thread
abbr., textile	relative humidity of air
energ.ind.	right-hand
R/H
abbr., avia.	right hand; radar height
R&H
abbr., el.	Rohm & Haas Co.
abbr., scottish	Van Rietschoten & Houwens BV (Netherlands)
abbr., textile	railways and harbors
R/H
energ.ind.	re heater
R & H
abbr.	railways and harbors (Vosoni)
abbr., commer.	railways and harbours
R/h
abbr., earth.sc.	roentgen/per hour
abbr., mil., avia.	roentgen per hour

r: 22 phrases in 3 subjects

Abbreviation	20
Chemistry	1
Rail transport	1