From eight chain thru, double pass thru, or completed double pass thru formation: Inner Code--the center block of four dancers works. Outsides stand pat: Inner Code #1--Centers Quarter in. Inner Code #2--same two Pass Thru. Inner Code #3--same two quarter in to face, etc. Inner Code #8 returns dancers to original spot but they're facing in the opposite direction. Outer Code--The outer four dancers work as the centers stand pat: Outer Code #1--Outsides quarter in to face each other. Outer Code #2--same dancers Pass thru to stand back to back, etc.
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.