6446 may refer to:
*
6-4-4-6
A 6-4-4-6 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, is one with six leading wheels, two sets of four driving wheels, and six trailing wheels.
Other equivalent classifications are:
* UIC classification: ...
, a Whyte notation classification of steam locomotive
*
6446 Lomberg, a minor planet
* The year in the
7th millennium
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