[Yandex Cloud documentation](../../index.md) > [Yandex Message Queue](../index.md) > [Concepts](index.md) > Queue labels

# Queue labels

A _label_ is a key-value pair used for logical queue labeling.

Queue label operation limits:

* Maximum number of labels per queue: 50.
* Label key parameters:

  * Must be from 1 to 63 characters long.
  * May contain lowercase Latin letters, numbers, hyphens, and underscores.
  * Must start with a lowercase Latin letter.

* Label value parameters:

  * Must be from 1 to 63 characters long.
  * May contain lowercase Latin letters, numbers, hyphens, and underscores.