The word "totallings" is a plural noun that refers to the act of totaling or adding up a set of numbers. The spelling of this word may seem unusual, but it follows the general rules of English spelling for words ending in "-ing". The "-ings" ending indicates a plural noun form derived from a verb, and the double "-l" is added to ensure correct pronunciation, /ˈtoʊtəlɪŋz/. Despite its somewhat uncommon appearance, "totallings" is a valid and valuable addition to the English language.