+ 2.0 3.0 3.2 4.0 1.0 2.0 3.0 4.0   1.0 2.0 3.0 4.0   1.0 2.0       1.0 2.1       0.9

<abbrev> container CSS: in-line element start tag required end tag required Sandia Referenc

This denotes an abbreviation. It is mentioned in "HTML Sourcebook" by Ian Graham.

Example:
the <ABBREV> element is used to markup abbreviations. (w3)

class= + 2.0 3.0 3.2 4.0
dir=
	"ltr"
	"rtl"
id= + 2.0 3.0 3.2 4.0
index= + 2.0 3.0 3.2 4.0
lang= + 2.0 3.0 3.2 4.0