What is distribution code 7 on box 7. Forms use to explain this

Here is IRS form 1099R.   Scroll down, back sides of the forms show the info and codes.   Codes start on page 7.

https://www.irs.gov/pub/irs-pdf/f1099r.pdf 

Code 7 is a Normal Distribution

Oh I missed you said code 7.  7 is a normal distribution.  It is the most common code.   

Distribution code 7 in box 7 on Form 1099-R means normal distribution.

Here is a TurboTax Help Article with all of the distributions codes and their meaning listed.