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R
+++-- Roentgen
++/-- Right
+/--- range
AcroLexic: Dictionary of Acronyms and Abbreviations contains 61 more definitions of “r”.
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See also

Acronym Definitions
CR 69
SR 67
RA 65
TR 57
PR 54
ER 52
RS 52
IR 51
MR 49
RC 49
RE 48
AR 48
RT 44
DR 43
CAR 42
PAR 41
RD 41
RM 41
CCR 40
RP 39