What's more, the filibuster isn't just a way of requiring 60 votes to pass legislation. Rather, "the filibuster can be thought of as the power of a single senator to object to the regular order of Senate deliberations, thereby invoking a special order that requires a supermajority and a week delay for a vote."Wikipedia:
Later, with the rise of power held by Polish magnates, the unanimity principle was reinforced with the institution of the nobility's right of liberum veto (Latin for "I freely forbid"). If the envoys were unable to reach a unanimous decision within six weeks (the time limit of a single session), deliberations were declared null and void. From the mid-17th century onward, any objection to a Sejm resolution — by either an envoy or a senator — automatically caused the rejection of other, previously approved resolutions. This was because all resolutions passed by a given session of the Sejm formed a whole resolution, and, as such, was published as the annual constitution of the Sejm, e.g., Anno Domini 1667. In the 16th century, no single person or small group dared to hold up proceedings, but, from the second half of the 17th century, the liberum veto was used to virtually paralyze the Sejm, and brought the Commonwealth to the brink of collapse. The liberum veto was finally abolished by the May Constitution of Poland in 1791.