A reference is a particular instance of a record title (or the first line of a record content) representing a pointer to another record or category of the same collection or a different one. The first two character of a record title or record content containing a reference should be “> “ ("greater-than" sign followed by a space).
a record titled “> Misc: Us State Capitals” is a reference to category
“Us State Capitals“ of collection “Misc”. Double clicking on this title
in a tag map or a table will cause the referred category to open up in its
default format (Tag Map or Table).