Prague 'okres LAU' code. Comes from CZSO register 101 (OKRES_NUTS) - yes these are confusing but that is how it is.
prg_okres_nuts
character vector of length 1
Other Codes and metadata:
prg_bbox_krovak,
prg_bbox_wgs84,
prg_fua_oecd,
prg_ico,
prg_kod,
prg_kraj,
prg_lau1,
prg_metro_oecd,
prg_nuts2,
prg_nuts3,
prg_okres