What is the collective noun for instruments?

There isn't one universally accepted collective noun for instruments.

Here are a few options, depending on the type of instruments:

* For a group of musical instruments: an orchestra, a band, an ensemble, a collection, a set, a repertoire.

* For a group of scientific instruments: a collection, a set, an array, a suite, a laboratory, a toolkit.

* For a group of surgical instruments: a set, a kit, a tray, a case.

Ultimately, the best collective noun depends on the specific context and the type of instruments you're referring to.