Filament

Filament could mean:

In physics and electrical engineering:
 Electrical filament
 Current filament
 Filament propagation, diffractionless propagation of a light beam

In astronomy:
 Galaxy filament
 Solar filament, a structure in a solar corona
 Birkeland current

In biology:
 Protein filament
 Filamentation, a long chain of cells
 Part of a stamen, the male part of a flower
 Hypha, in fungi and Actinobacteria

Other uses:
 Fiber or yarn
 2002 movie by Jinsei Tsuji