(typography) Capital letters shown in the same form but in small size (typically of the same size as lower-case letters).
2006, Nigel French, chapter 3, inInDesign Type: Professional Typography with Adobe InDesign CS2, Adobe Press,→ISBN,page37:
Becausesmall caps are smaller than full size caps—slightly larger than the x-height—they are less obtrusive and do not overwhelm the upper and lower case type as full size capitals would.
2017, Tom Gardner, David Gardner,The Motley Fool Investment Guide, 3rd edition, Simon and Schuster,→ISBN,page91:
So, depending on the study you look at,small caps either outperform or they don't. But either way, we think they make a great addition to a well-diversified portfolio.