Tack

Tack may refer to:

People

Tack (sewing) (also baste or pin), quick, temporary stitching intended to be removed
Blu Tack, a reusable putty-like pressure-sensitive adhesive used for attaching paper items to walls
Horse tack, equipment used to allow riding or driving of horses and some other riding animals
Thumbtack or drawing pin, a short nail or pin easily placed and removed by hand
Shoe tack, a type of cut nail, used in upholstery, shoe making and saddle manufacture
Tack weld, a specific short and often temporary type of weld
Upholstery tack or furniture tack, a type of short nail more robust and resistant than the drawing pin.

A tack as a part of the tacking maneuver; in which a sailing boat turns its bow through the wind
Tack (sailing), the lower corner of a sail's leading edge
Tack (square sail), a type of rigging unique to square sails

Hardtack, a hard cracker or biscuit used for food on sea voyages and by soldiers during the American Civil War.
Scottish lease, as held by a tacksman
Tack, another name for stickiness in chemistry
The Tack, a parliamentary maneuver supported by Tackers in 1704
The grand tack hypothesis on the origin of the structure of the Solar System
"TACK", a proposed archaeal taxon, presumably a sister taxon of hypothetical "Asgard" taxon within the "Proteoarchaeota" kingdom; now renamed to Thermoproteati
TACK, a proposed network security standard co-created by Moxie Marlinspike
Any of the four symbols
right tack $\vdash$
down tack $\top$
up tack $\bot$
left tack $\dashv$