This is the 8683rd most frequent Japanese word.
日東
"日東" (Nittō) refers to "the eastern sun" or "east of the sun."
In this sentence, 日東 refers to the specific name of a company, Nitto Import Company, which uses the characters as part of its name.
私の祖父は昔、日東輸入会社で働いていました。
My grandfather used to work for Nitto Import Company.
In this sentence, 日東 could be interpreted as referring to eastern areas of Japan. It uses '日' (Japan) and '東' (east), denoting a geographical interpretation.
日東地方は特に冬の天気が厳しいです。
The eastern regions of Japan have particularly harsh weather in winter.
In this sentence, 日東 refers to a brand name, implying a company or a trademark using these characters as part of its branding.