The term 'Office Staple' refers to the essential items found in most offices. These items include a COPIER (6 letters), which is a machine used to make multiple copies of documents; a FAX (3 letters), which is a device used to send documents electronically; a DESK (4 letters), which is a piece of furniture used for writing and other activities; and a file cabinet (11 letters), which is a storage unit used to organize documents. Together, these items are essential for any office.