A procedure mask is used for performing patient procedures, or when patients are in isolation to protect them from potential contaminants. They are used for 'respiratory etiquette' to prevent people from spreading germs via talking, coughing, or sneezing.
Rolling-wave planning is the process of project planning in waves as the project proceeds and later details become clearer; similar to the techniques used in agile software development approaches like Scrum.. Work to be done in the near term is based on high-level assumptions; also, high-level milestones are set.
Rolling Forward, also known as Roll Over, an options contract is one of four things an options trader can do when their options contract is at or near expiration. The other three actions being to Exercise the option, close it off or simply let it expire out of the money.