thumb|right|Isogrid on the interior of the adapter connecting the Orion spacecraft to the Delta IV rocket for Exploration Flight Test 1
thumb|right|Isogrid on the interior of the adapter connecting the Orion spacecraft to the Delta IV rocket for Exploration Flight Test 1
Isogrid is a type of partially hollowed-out structure formed usually from a single metal plate with integral triangular stiffening stringers. It was patented by McDonnell Douglas (now part of Boeing) in 1975. Isogrids are extremely light and stiff. Compared to other materials, it is expensive to manufacture, and so it is restricted to spaceflight applications and some aerospace use.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).