IJ meaning in Academic & Science ?

Answer: What is interjection mean?

An interjection is a word or expression that occurs as an utterance on its own and expresses a spontaneous feeling or reaction. It is a diverse category, encompassing many different parts of speech, such as exclamations (ouch!, wow!), curses (damn!), greetings (hey, bye), response particles (okay, oh!, m-hm, huh?), hesitation markers (uh, er, um) and other words (stop, cool). Due to its diverse nature, the category of interjections partly overlaps with a few other categories like profanities, discourse markers and fillers. The use and linguistic discussion of interjections can be traced historically through the Greek and Latin Modistae over many centuries.

reference

Full Form	Category
interjection	Academic & Science
Indiana Jones	Community
Ignatius Jehosaphat	General
Isaac Joseph	General
Internet Journal	General
Ink Jet	General
Infinite Jest	General
Intermediate Junction	General
Impossible Jump	General
Institute for Justice	Governmental
Immigration Judge	Governmental
ITAUNJA	Indian Railway Station
Im Jahre	International
Internal Jugular	Medical