House call
A Call from a Broker to a Customer (called a Maintenance margin call) or from a Clearinghouse to a Clearing member (called a variation Margin call) demanding the deposit of Cash or marginable securities to satisfy the Regulation T requirements and the House maintenance requirement for the Purchase or Short sale of securities or to Cover an adverse price Movement. also called federal margin Call or Reg. T Call (for NASD requirements) or Margin call.