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vim の変数のスコープ

とりあえず、「s:」と「l:」だけ覚えておけばよさそう。

:help internal-variables で調べられる

There are several name spaces for variables.  Which one is to be used is
specified by what is prepended:

                (nothing) In a function: local to a function; otherwise: global
|buffer-variable|    b:   Local to the current buffer.
|window-variable|    w:   Local to the current window.
|tabpage-variable|   t:   Local to the current tab page.
|global-variable|    g:   Global.
|local-variable|     l:   Local to a function.
|script-variable|    s:   Local to a |:source|'ed Vim script.
|function-argument|  a:   Function argument (only inside a function).
|vim-variable|       v:   Global, predefined by Vim.