Unlike the other mountain emojis (⛰️, 🏔️), this one points to a specific place: 'Mount Fuji.' Therefore, it's most natural to use it only in conversations directly related to Japan.

Mount Fuji has long been considered a source of artistic inspiration and a sacred place for the Japanese people. Like the map of Japan (🗾), it's a symbolic emoji that was included because emojis originated in Japan. It can be seen as another example that shows the history of emojis. So, using it when talking with a Japanese friend can convey a more special meaning.