A Wireless Cable DSL Router is a wireless router that is compatible with both DSL/ADSL and cable broadband. The alternative is a dedicated wireless ADSL router or wireless cable router.
If you are unsure as of the type of broadband that you have (cable or DSL), then it is a good idea to a wireless cable DSL router. It will work on most types of broadband.
Even if you do know whether you have DSL or cable broadband, buying a wireless router that is compatible with both can be a good option. If you decide to switch to a different kind of broadband later, then your wireless router will still work.