It seems like you might be referring to "Nadar," which can refer to a few different things. Here are a couple of possibilities:
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Nadar (the photographer): Gaspard-Félix Tournachon, known as Nadar, was a French photographer, caricaturist, and balloonist. He was one of the first to take aerial photographs and is known for his portraits of famous figures and for popularizing photography as an art form in the 19th century.
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Nadar (the term): In some contexts, "nadar" can also mean "to swim" in Spanish.
If you meant something else or need specific information, please provide more details!