8 mm.:

1.  Film usage:  A narrow gauge film introduced for home use in 1933 by Kodak.  The term "standard 8 mm." covers this basic film and distinguishes it from the later improved  "super 8 mm." (introduced by Kodak in 1965) and "single 8 mm." (the Japanese equivalent of super 8 mm. introduced by Fuji).

2.  Video usage:  A videocassette format using 8 mm. metal particle tape.  It is housed in a mini-cassette and designed for small-size camcorders.

See also Hi-8 mm.