vim 地图中的 `&` 是什么意思

What does `&` mean in vim map

在某些地图中,我发现了 :imap 的差异。

部分地图开始*,部分地图是否开始&

什么意思?

来自:help map-listing

Just before the {rhs} a special character can appear:
    *       indicates that it is not remappable
    &       indicates that only script-local mappings are remappable
    @       indicates a buffer-local mapping