They were referred to as "four-cornered" sails.
One type is the "lateen sail", but there are also jibs; Genoa & spinnaker.
Square sails (rectangular) were (are) called four-cornered sails.
Lateen
the caravel has triangular sails as well as square sails. Square sails carried the ship forward when the wind was at its back. Triangular sails allowed the caravel to sail into the wind. the caravel was better than other euoopean ships of the time at this type of sailing
Some reasons why the caravel was a good ship for exploration were that they were agile and easier to navigate, with a tonnage of 50 to 160 tons and 1 to 3 masts, with lateen triangular sails allowing beating.Being smaller and having a shallow keel, the caravel could sail upriver in shallow coastal waters. With the lateen sails attached, it was highly maneuverable and could sail much nearer the wind, while with the square Atlantic-type sails attached, it was very fast.
A type of sail
They built caravels, made better maps, used the rudder, used the lateen (a triangular sail), used an astrolabe, also used a compass.
Portuguese exploration was aided by advancements such as the caravel ship design, navigational tools like the astrolabe and compass, and the development of more accurate maps and charts. Additionally, improvements in cartography and the sharing of knowledge with other explorers and navigators contributed to their successful exploration efforts.
windmill
It depends on what type of prism. Is it a rectangular prism, a triangular prism, etc?
Type of ship, had square sails and was capable of crossing oceans. Columbus, most famous use of, 'discovered' the new world with caravels.
Schmitt trigger converts any type of waveform (such as sine,triangular.........)to square wave.So it is called Square wave converter.