The 'Lion Flag' is often considered the unofficial national flag and referred to as the 'Royal Flag of Scotland'. The 'Royal' term applies because this flag historically, and legally, belongs to the monarchy (or royalty) - more specifically to a King or Queen of Scotland.
As there hasn't been a Scottish King or Queen since the 17th Century, it now belongs to Queen Elizabeth II. It's a more colorful and dramatic flag than the Saltire, and may be a little more memorable because of that.
The term 'lion rampant' actually refers to the positioning or attitude of the lion. A rampant lion is shown as a profile of a lion standing upright (on one or both hind legs) and the forelegs are raised, claws unsheathed, as if to strike.
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