From Wiktionary, the free dictionary
Initialism from the names Ron and Hermione.
R/Hr
- (fandom slang) The ship of characters Ron Weasley and Hermione Granger of the Harry Potter series.
2003 September 30, Tim Behrendsen, “Re: My input on Ha/Hr”, in alt.fan.harry-potter[1] (Usenet):For what it's worth, the vast majority of the fandom picks up on R/Hr over H/Hr.
2005 July 21, Frank Secada, “Viking Ginny? (spoilers)”, in alt.fan.harry-potter[2] (Usenet):So many H/G and R/Hr shippers were high-fiving each other last Saturday, it was quite fun.
2005 September 17, Louis Epstein, “Re: HBP Chapter 22 re-read”, in alt.fan.harry-potter[3] (Usenet):And what would Lavender have done to deserve this, aside from be an obstacle to R/Hr 'shippers?