Silence; and the presence of experienced meditators.

Yes. The bodhi tree is significant for meditators because it was under such a tree that Buddha became enlightened.

A Hindu, like other meditators, will find that meditation is an ongoing process. While the techniques may change over time, one's longing to bring more awareness to the present moment will continue to grow. Ultimately, one will be meditating in every moment, regardless of the activity one is engaged in.

There are many acronyms for A.U.M.

Here are some.

Austin Texas has the AUM airport code

The Association of University Meditators a club in some schools. Ommm!

The one you need might well be:

Animal Unit Months This is used for grazing assessment or carrying capacity of acreage when dealing with ruminant herds like sheep and cows.