What does HM stand for?

Hidden Mickeys (in Disney theme parks)

This definition appears very rarely and is found in the following Acronym Finder categories:

Slang/chat, popular culture

Other Resources:

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Hectometer Helicopter Mine Countermeasures Squadron (US Navy aviation unit designation used from 1971 to present) Helper Monkey Hennes & Mauritz Henry Molaison (memory loss patient) Her/His Majesty Herbal Medicine Herrschende Meinung (German: prevailing opinion; legal) Hey Mercedes (band) Hidden Machine (Pokémon)		High Maintenance High Moment (chemistry) Higher Mind (Sri Aurobindo, Indian Yogi and philosopher) Highly Magnified Hindu Munnani (Tamil Nadu movement) Hindustan Motors Hiring Manager Historia Mexicana History in the Making History Matters (educator resources website)

Samples in periodicals archive:

Hidden Mickeys are silhouettes of Mickey Mouse that show up in an unexpected location.

What to Expect when Going for a Disney World Vacation

He keeps squeezing them in, adding 47 Disney rides, 111 cast members and 13 hidden Mickeys to the characters.

1,643 tattoos flaunt fan's fervor He lives and breathes all things ...

SOME fans, obviously with nothing better to do than rewind tapes of their favourite movies, even claim to have spotted Hidden Mickeys in films as diverse as Cinderella (1950) and The Lion King (1994).

DON'T FORGET THE MOUSE - THE WALT DISNEY YEARS - PART TWO; ...