seed

Definition

In cryptography a 'seed' is a pseudorandomly generated number, often expressed in representation of a series of words.
Paraphrased from wikipedia

Example 24-word seed

broken toddler farm argue elder behind sea ramp cake rabbit renew option combine guilt inflict sentence what desert manage angry manual grit copy hundred

Test here yourself.

Pseudorandom is not exactly random

Although sequences that are closer to truly random can be generated using hardware random number generators, pseudorandom number generators are important in practice for their speed in number generation and their reproducibility.
Source wikipedia