51 nations
...that 51 nations participated in the FIBA World Championship as of the 2006 tournament?
...that <b id="mwBtw"><a class="mw-redirect" href="./National_team_appearances_in_the_FIBA_World_Championship" id="mwBt0" rel="mw:WikiLink" title="National team appearances in the FIBA World Championship">51 nations</a></b> participated in the <a class="mw-redirect" href="./FIBA_World_Championship" id="mwBt4" rel="mw:WikiLink" title="FIBA World Championship">FIBA World Championship</a> as of the <a href="./2006_FIBA_World_Championship" id="mwBt8" rel="mw:WikiLink" title="2006 FIBA World Championship">2006 tournament</a>?