What does ROH stand for?

Raeto-Romance - GeoNet three-character language code (GEON)

Rat Ovarian Hyperemia - Test (MAE)

Ray of Hope - An association (EA)

Rear Overhead - TII (TAG)

Receiver Off-Hook - Telecommunications (VLIE)

Registered Occupational Hygienist (SARE)

Regular Overhaul - Navy (NG)

Restricted Overhaul (SAUS)

Returned on Hire

Robinhood - Australia - Airport symbol - Obsolete (OAG)

Rohm & Haas - NYSE symbol

Rohm & Haas Co. - NYSE symbol (SPSG)

Rohtak - India - Seismograph station code, US Geological Survey - Closed (SEIS)

Romam - Language code (ETLW)

Romerwerk - NCIC firearms make code (NCIC)

Routine Overhaul - Indian Railway (TIR)

Royal Opera House - Covent Garden, London

Run of the House Rate - Travel industry (TVEL)

Rhaeto-Romance - MARC language code - Library of Congress (LCCP)