Question: Otto Jespersen was a Danish linguist who coined the term Content clause which are also know as what?

Context paragraphs:
Jespersen's Cycle: Jespersen's Cycle (JC) is a series of processes in historical linguistics, which describe the historical development of the expression of negation in a variety of languages, from a simple pre-verbal marker of negation, through a discontinuous marker (elements both before and after the verb) and in some cases through subsequent loss of the original pre-verbal marker.  The term originated in the 1979 publication "Typology of Sentence Negation" by Swedish linguist Östen Dahl.  Dahl coined it in recognition of the pioneering work of Otto Jespersen in identifying this pattern of language change.

Vilhelm Thomsen: Vilhelm Ludwig Peter Thomsen (25 January 1842 – 12 May 1927) was a Danish linguist and Turkologist.  He initially began studying theology at the Danish University in 1859, but soon switched his focus to philology.  He learned Hungarian and Finnish, and received his doctoral degree in 1869 with a dissertation on Germanic loanwords in Finnic.  He taught Greek at the Borgerdyd school in Copenhagen before becoming a professor at the University of Copenhagen; among his students at the university was Otto Jespersen.

Content clause: In grammar, a content clause is a subordinate clause that provides content implied or commented upon by its main clause.  The term was coined by Otto Jespersen.  They are also known as "noun clauses".  There are two main kinds of content clauses: declarative content clauses (or "that"-clauses), which correspond to declarative sentences, and interrogative content clauses, which correspond to interrogative sentences.

Universalglot: Universalglot is an "a posteriori" international auxiliary language published by the French linguist Jean Pirro in 1868 in "Tentative d'une langue universelle, Enseignement, grammaire, vocabulaire".  Preceding Volapük by a decade and Esperanto by nearly 20 years, Universalglot has been called the first "complete auxiliary-language system based on the common elements in national languages".  In his book describing his own language project Novial, Otto Jespersen praised the language, writing that it is "one to which I constantly recur with the greatest admiration, because it embodies principles which were not recognized till much later".

Dania transcription: Dania (Latin for "Denmark") is the traditional linguistic transcription system used in Denmark to describe the Danish language.  It was invented by Danish linguist Otto Jespersen and published in 1890 in the "Dania, Tidsskrift for folkemål og folkeminder" magazine from which the system was named.

Prosiopesis: Prosiopesis (from Classical Greek, προσιωπησις, "becoming silent") is a term coined by Otto Jespersen for pronouncing a word or phrase without vocalizing its initial sounds.  One example Jespersen gave is for "Good morning" to be shortened to "Morning".  Jesperson introduced the idea in "Language, Its Nature, Development, and Origin" (ASIN B0007DEMMW; 1922); he also discusses it in "The Philosophy of Grammar" (ISBN  ; reprint 1992).  Prosiopesis is studied as a mode for originating interjections, which can shed light on their meaning.

Novial: Novial ["nov-" ("new") + "IAL, International Auxiliary Language"] is a constructed international auxiliary language (IAL) for universal communication between speakers of different native languages.  It was devised by Otto Jespersen, a Danish linguist who had been involved in the Ido movement, and later in the development of Interlingua de IALA.

William Edward Collinson: William Edward Collinson (4 January 1889 – 5 June 1969) was an eminent British linguist and, from 1914 to 1954, Chair of German at the University of Liverpool.  Like Edward Sapir and Otto Jespersen, he collaborated with Alice Vanderbilt Morris to develop the research program of the International Auxiliary Language Association (IALA).  From 1936 to 1939, he was Research Director of IALA.  Under Collinson's guidance, methods of compiling international word material were tested at Liverpool.  In 1939 IALA moved from Liverpool to New York and E. Clark Stillman succeeded Collinson as Research Director.  Alexander Gode, editor of the first English-Interlingua dictionary published in 1951, remained in contact with Collinson which had collected much of linguistic material in the University of Liverpool.

Nexus grammar: Nexus grammar is a system of analysing text which was first used in Denmark.  It was a system that was heavily advanced by the Danish Linguist Otto Jespersen.  It most often refers to the relationship between the action and the subject in the sentence.  This system has been developed to include symbols for most parts of speech.

Otto Jespersen: Jens Otto Harry Jespersen or Otto Jespersen (] ; 16 July 1860 – 30 April 1943) was a Danish linguist who specialized in the grammar of the English language.

Supporting paragraphs: Content clause Otto Jespersen
Answer: noun clauses