a Lateen Sail
The writing system invented in ancient Mesopotamia was cuneiform. The Sumerians invented it more than 5000 years ago. It was written by making triangular marks on a clay tablet.
a triangular pyramid
They can be any kind of triangles.
A new kind of ship, the caravel, was stronger and better built than earlier ships. It had triangle-shaped sails that allowed it to sail against the wind. Ships could now travel far out into the ocean. The magnetic compass allowed sea captains to better stay on course.
Its a triangular prism.
it depends on the the kind of shape it is.
triangular head means venomous so stay away
Double hulled ships, outriggers Double hulled ships, outriggers
Transportation ships and river cruises.
Acronyms are allowed.
This depends what you are trying to work out, and what kind of triangle you have.
A regular pyramid has an equilateral triangular base