While I can understand the percentage sign % being chosen to represent the current file, just because you need to choose some character for that, I am curious as to why
'<,'> is representative of the current visual selection.
Why not just use a single character to represent the visual selection?
Can these characters be parsed to have a different meaning?
'<supposed to mean something like,
The lesser than value of the quoted text ?
Are there any other useful variations of
'<,'>that I should know, say for example,