Thank you for your inquiry, Michelle! BS is a bunk set. Duo is a duo bunk (full size bed on bottom and twin bed on top). Tr is a trundle bed and QSS is a queen sleeper sofa. To view all of our bedding abbreviations, please visit https://www.twiddy.com/abbreviations-definitions.aspx.
- Answered by Twiddy on 1/6/2016