没有缩写，set在单词意思中有一套，一副的意思，可以用来表示套。

n.一套，一副，一组(类似的东西);一组(配套使用的东西);一伙(或一帮、一群)人;阶层;团伙

例句：

You can borrow my keys ─ I have a spare set.

你可以借用我的钥匙——我还有一套。

As it happens, I have a spare set of keys in my office.

碰巧我在办公室有一套备用钥匙。

On his retirement, colleagues presented him with a set of golf clubs.

在他退休之际，同事们赠给他一套高尔夫球杆。

There must be one set of laws for the whole of the country

整个国家必须要有一套统一的法律。