Wikipedia:Insignificance

Insignificant material is material that is not prominent, meaning that there are no articles on Wikipedia for which the material has WP:DUE WEIGHT.

A non-notable topic is one that as per WP:N is not "worthy of notice" to have a stand-alone article. An insignificant topic is both non-notable and not otherwise suitable as a redirect.

As per WP:Deletion policy, an article with both an insignificant topic and insignificant material may be deleted.

Alternatives to deletion
While a topic may be too non-notable to merit its own article, the topic may be significant as a redirect.

Aspects of the topic may be prominent when discussed in a related article. As an alternative to outright deletion, editors should consider merging specific material into other articles as appropriate, while maintaining copyright compliance as described at WP:Merge and delete.

Further reading from WP:N
WP:N states,

For articles of unclear notability, deletion should be a last resort. ... If appropriate sources cannot be found after a good-faith search for them, consider merging the article's verifiable content into a broader article providing context.