Armstrong refers to several notable figures and entities, but most commonly, it is associated with Neil Armstrong, the first person to walk on the moon during the Apollo 11 mission in 1969. His famous words, "That's one small step for man, one giant leap for mankind," marked a significant achievement in space exploration and human history. Another prominent reference is Louis Armstrong, an influential American jazz musician known for his trumpet playing and unique vocal style. He played a key role in popularizing jazz music in the early 20th century and is celebrated for his contributions to the genre, including iconic songs like "What a Wonderful World."