300px|thumb|Right circular conoid:
300px|thumb|Right circular conoid:
In geometry a conoid () is a ruled surface, whose rulings (lines) fulfill the additional conditions: (1) All rulings are parallel to a plane, the directrix plane. (2) All rulings intersect a fixed line, the axis.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).