Rw is likely misspelled.
Rw has no English definition.
As a noun WR is
world record.
rw
Translingual
Symbol
(
head)
The ISO 3166-1 two-letter (alpha-2) code for Rwanda.
ISO 3166-1
wr
English
Noun
(
en noun)
(sports) world record
(star) Wolf-Rayet star
See also
* (astronomy) WD , RD , PSR