Clopen

clopen may refer to:

• a clopen set as in topology (a branch of mathematics)
• a term used by workers in retail and service jobs when then have to close one night, and open the following day. This term can be used either as a noun ("my schedule has a clopen this week"), or as a verb ("looks like I have to clopen")

See also: Clopen, Clopen set, Mathematics, Retail, Service, Topology