mote \moht, noun:

1. A small particle or speck, especially of dust.
2. Moit.

A tiny mote of dust is truly a cosmos unto itself, that much we do now know. It contains molecules that are far too small for us to see without a microscope, but they are no less real than the dust itself or the piano on which the mote of dust has settled.
— Roger A. Caras, Cat Is Watching

A white mote hovered in the air several feet away from her.
— Sara Stern, Dragon’s Song

Mote stems from the Norwegian word mutt meaning “a speck.”