R.
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In the signatures of royal persons, "R." is an abbreviation for "rex" (king) or "regina" (queen.) In descriptions of land, acoordlng to the divisions of the governmental survey, it stands for "range."
Ottumwa, etc., R. Co., v. McWllliams, 71 Iowa 164, 32 N. W, 315.