Deletion of Quaternion rotation biradial

Comment: Quaternion rotation biradial" appears to be an obsolete historical term for the product of an imaginary quaternion and the multiplicative inverse of another imaginary quaternion and, as such, is an unnecessary content fork of the main article quaternion.  I could not find a single reputable use of the term after about 1920, with most google books hits from before 1900, mostly to Hamilton himself.  Wikipedia should not be in the business of promoting new terms for things () and, by extension, should not be in the business of resurrecting obsolete terms for things as if they were still in wide use.  Many of the terms in the article have this character: "quadrantal versor", etc.  The notation, too, is unwieldy and unexplained, and seems almost deliberately calculated to produce an impenetrable text.  The fact that quaternions can be understood "actively" as rotations (and dilations) is elementary in modern mathematics, without the need to dust off old unused concepts from the 19th century. It is, in fact, already the subject of the article quaternions and spatial rotation.  I would not object to pointing out there the geometrical interpretation of ab^{-1}, but I don't see that a separate article written in an impenetrable archaic style is warranted.  The second section of the paper, on the "geometric algebra" perspective, appears to be entirely the author's own |original research, and as such is not allowed here anyway
Stance: delete
Cited policy: Wikipedia:Wikipedia is not a dictionary (WP:NEOLOGISM||WP:OR)