The Architectural Product is one of the two main parts of the Architecture Content Framework. The concept is not stressed and not defined precisely. It can be seen, though, as the generalized concept of "deliverable", "artifact" and "building block".
The concepts "deliverable", "artifact" and "building block" are defined as "type of architectural work product" (TOGAF9, ch. 33.1, p. 361)
"The TOGAF content framework provides a detailed model of architectural work products,including deliverables,artifacts within deliverables,and the architectural building blocks that artifacts represent." 
- TOGAF9, ch. 4.1, p. 41