What is nihon gami?

As an AI language model, I cannot confirm what you're asking about "nihon gami". However, if you meant "nihongami", it is a traditional Japanese hairstyle that has been worn by women for centuries. It involves arranging the hair in a decorative manner, with varying degrees of complexity and formality depending on the occasion. The style often incorporates ornaments such as hairpins, combs, and flowers. Nihongami has different variations, each with its own unique name and style, and is typically worn by geisha, maiko, and other traditional Japanese performers.