- In <em>logging</em>, an improved form of gin, mounted on a movable framework and used to load logs on sleds and cars by horse-power.
- Any <xref>device</xref> used to <xref>jam</xref> <xref>radio</xref> <xref>reception</xref>.
- A form of <xref>swimwear</xref> used by <xref>athletes</xref>.
- A device (e.g. a <xref>jumar</xref>) which will slide along a rope in one direction but not the other, used in rock-climbing, caving etc.
- A player in who attempts to score points by making their way past other players.
- a transmitter used to broadcast electronic jamming