I like the CCCLAS acronym for Import Wizard. 

I made up a different acronym, which I offer in case anyone finds it useful (hope it doesn't add any confusion).  This one has the objects in an order that starts at the top of the data model: ACL-SC plus Custom Objects.  I picture a student athlete with an ACL tear at (U)SC (University of Southern California) - plus custom objects!  Accounts, Contacts, Leads, Solutions, Campaign Members, and custom objects.  (I remember that it's "Campaign Members" and not "Campaigns" because those are people, like Leads and Contacts). 

It also helped me to visualize the Import Wizard and remember that it's only for these select objects when I learned that these wizards used to be on the individual objects before they were gathered up into one Import Wizard.  Also, I think of the twirling line at the top as a wizard's wand! 

The documentation on this page suggests that it's slightly different objects - anyone have an explanation?  "To import accounts, contacts, leads, solutions, person accounts, or articles, click Standard Objects. To import custom objects, click Custom Objects." https://help.salesforce.com/articleView?id=import_with_data_import_wizard.htm&type=5