Example of a <a href="https://en.wikipedia.org/wiki/Bloom_filter" class="extiw" title="en:Bloom filter">Bloom filter</a>
<a href="//commons.wikimedia.org/wiki/User:David_Eppstein" class="mw-redirect" title="User:David Eppstein">David Eppstein</a>
self-made, originally for <a rel="nofollow" class="external text" href="http://www.ics.uci.edu/~eppstein/pubs/EppGoo-WADS-07.pdf">a talk at WADS 2007</a>