3) In hardware design, a prototype is a hand-built model that represents a manufactured (easily replicable) product sufficiently for designers to visualize and test the design. The word prototype comes from the Latin words proto, meaning original, and typus, meaning form or model.
In chemistry, a salt is an ionic compound which is made up of two groups of oppositely charged ions. The ion with a positive charge is called a cation, and the one with a negative charge is called an anion.
saltire(Noun) An ordinary (geometric design) in the shape of an X. It usually occupies the entire field in which it is placed. Saltire. a St. Andrew's cross, or cross in the form of an X, -- one of the honorable ordinaries.