Suggestions for Selecting Steel Distributors A beam having an I or H-shaped cross-section is known as an I-beam. However, it goes by other names as well, including H-beam, w-beam, universal beam (UB), rolled steel joist (RSJ), and double-T (particularly in Polish, Bulgarian, Spanish, Italian, and German). **[i beam size](https://www.reddit.com/user/Kianhuatmetalbl/comments/1425ccr/suggestions_for_selecting_steel_distributors/?utm_source=share&utm_medium=web2x&context=3)**