For example, at one time, the Greeks held the opinion that 1 (one) was not a number, but rather a unit of arbitrary length.

The set of all decimal numbers of arbitrary length is an example for an infinite language.

Payload for the different kind of answers (Can be an arbitrary length, left to implementation detail.

Most algorithms are designed to work with inputs of arbitrary length.

C has the ability to initialize arrays of arbitrary length.

Another example is a language learning algorithms that can produce sentences of arbitrary length.

A command line can have practically arbitrary length, and is a series of tokens.

How can you not process a password of arbitrary length?

This has a nice side effect of allowing us to produce keyphrases of arbitrary length.

Convolutional codes work on bit or symbol streams of arbitrary length.