[RockChucker]

What's a quorum call?

[OXENinFLA]

http://www.senate.gov/reference/glossary_term/quorum_call.htm

quorum call - A call of the roll to establish whether a quorum is present. If any Senator "suggests the absence of a quorum," the Presiding Officer must direct the roll to be called. Often, a quorum call is terminated by unanimous consent before completion, which permits the Senate to use the quorum call to obtain a brief delay to work out some difficulty or await a Senator's arrival.

[OXENinFLA]

quorum - The number of Senators that must be present for the Senate to do business. The Constitution requires a majority of Senators (51) for a quorum. Often, fewer Senators are actually present on the floor, but the Senate presumes that a quorum is present unless the contrary is shown by a roll call vote or quorum call.