You will see and hear  lots of acronyms being used and they may be confusing at first.  Here's a list of some of the more commonly used ones to help you out.

BPOU - Stands for Basic Political Operating Unit, and it's one of the smallest units of political organization.   It's the group you'll caucus with early in an election year.  It consists of several precincts, but depending on population density it's geographical size can vary.  In rural areas it can be a county (or even multiple counties), but in a major metropolis a single city can consist of a number of BPOUs. Our BPOU is 53A.

CD - Stands for Congressional District, which are determined by the last US Census.  Each Congressional District sends one Representative to the US House.  The CD consists of a number of BPOUs, and each BPOU sends delegates to help nominate a candidate.  HD53A has precincts in  both the 4th and 6th Congressional Districts.

HD - Stands for House District.  Each House District sends one Representative to the Minnesota Legislature.  Two House Districts make up one Senate District.  HD53A is in Senate District 53.

RNC - Stands for Republican National Committee and is the national governing body of the Republican Party.

RPM - Stands for Republican Party of Minnesota, and is the state governing body of the Minnesota Republican Party.

SD -Stands for Senate District.  Each Senate District sends one Senator to the Minnesota Legislature.  SD53 is comprised of HD53A in the west and HD53B in the east.