Answer:
The Saltire, also known as the St. Andrews Cross, is a heraldic symbol that consists of a diagonal cross, shaped like the letter X. It is named after Saint Andrew, the patron saint of Scotland.
The Saltire is commonly featured in the flag of Scotland, where it is combined with the blue background. The X-form of the Saltire represents the martyrdom of Saint Andrew, who was crucified on an X-shaped cross instead of the traditional upright cross.
In addition to its heraldic and national significance, the Saltire has become an iconic symbol of Scottish identity and is widely recognized around the world. It is often displayed during various Scottish events, sports competitions, and celebrations.
On the other hand, the term X-form stretcher is not a commonly used phrase and does not have a specific meaning or reference in different fields. It is possible that it might refer to a stretcher used in emergency medical services or rescue operations that has an X-shaped design, but without further context, it is difficult to determine its precise meaning.