Telescope can refer to:

In astronomy and in general:

• An optical tool. Old-type telescopes were often made from tube sections that slid inside each other for easier stowage when not being used. As a result, anything that can lengthen and shorten in this way is said to be telescopic (adjective), and the process of shortening in this way is called telescoping (verb).
• A constellation, called Telescopium.

In mathematics:

• The concept of a telescoping sum is derived from the sense above.

In transportation:

• When trains collide, the carriages can sometimes slide through each other, rather like a telescope folding into a more compact form for ease of storage. Unlike a telescope which is full of air, a train full of passengers would suffer serious injuries or fatilities if telescoping occurred.

In archery:

• Similar to the phenomenon with trains stated above, when a fiberglass arrow rear-ends another, imbedding itself deep into the other.

The Telescopes, a British dream-pop band.

Télescope (homonymie)