We use triangular, movable sails, and never more than two.
Its triangular sail makes use of some effects of fluid dynamics.
This technique became possible with the invention of the triangular sail.
Melora lifted her arms to show the triangular sails underneath.
The crew even raised the triangular sail, allowing the ship to move out to deeper water.
On her single, green, triangular sail was a black bull's head.
Now the galley was running free again, and her triangular sails stood out to take the wind.
As for a triangular sail, this refers to the topmost part.
There is no evidence of any triangular sails in use.
Another pair shook out the small triangular sail on the foremast.