In the Rajya Sabha, which device is used to raise a matter of public importance that cannot be raised under the question hour, half-an-hour discussion, short duration discussion, or any other regular motion of the House?

Explanation

A matter which is not a point of order or which cannot be raised during question hour, half-an-hour discussion, short duration discussion, or under adjournment motion, calling attention motion, or under any other rules of the House, can be raised under 'Special Mention' in the Rajya Sabha.