It's short for "rabbeinu Mosheh ben Maimon", Mosheh ben Maimon ("Moses son of Maimon") being his name and "rabbeinu" meaning "our teacher". A number of important historical rabbis have "nicknames" of this form, nearly all of them starting with R (for "rabbeinu").
Maimonides, also known as the Rambam, was born in Cordoba, Spain in 1135 AD.
Rabbi Moshe ben Maimon, also known as "Rambam" or "Maimonides."
Rambam isn't a 'what', he was a person. Rambam, also known as Maimonides, who's real name was Rabbi Moses ben-Maimon, was one of the greatest Torah scholars of the Middle Ages. He lived 1135-1204 CE. For more information, please see the related link.
Maimonides was a person, not a thing. Maimonides - his full name was Moses ben-Maimon - was one of the greatest Torah scholars and physicians of the medieval ages. Please see the related link for his history.
The Rambam (which is a Hebrew acronym) is identical with Rabbi Moses Maimonides (1135-1204), a rabbi and prolific author of important Torah-works. His magnum opus was the Mishneh Torah ("Yad Hachazakah"), a codex of Jewish law upon which all later such works are based to a large extent. If someone says "a Rambam," it could mean a volume of the above set of books, since we often refer to a rabbi by the name of his writings.
Rambam Mesivta was created in 1993.
Rambam Square was created in 2001.
The population of Yad Rambam is 1,028.
Yad Rambam was created on 1955-11-06.
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Rambam Health Care Campus was created in 1938.
Maimonides