This is the 5352nd most frequent Japanese word.
nintendo
"Nintendo" (任天堂) can be interpreted as "Leave luck to heaven."
In this sentence, 'Nintendo' (任天堂) functions as a proper noun referring to the company's name.
任天堂は有名なゲーム会社です。
Nintendo is a famous gaming company.
Here, 'Nintendo' (任天堂) is used as a shorthand for the gaming console or games produced by Nintendo.
子供たちは任天堂で遊んでいます。
The children are playing Nintendo.
In this example, 'Nintendo' (任天堂) specifies games made by the company Nintendo.