A clickable reference to a figure numbered with {{figlabel}}. {{figref|fig:1}} gives Fig. 1, linked to the figure itself.
A second parameter replaces the word, and an empty one drops it—useful in a list:
{{figref|fig:1|Figs.}} and {{figref|fig:2|}}
reads Figs. 1 and 2, both clickable.
It uses {{#var_final:}}, which is resolved at the end of the parse, so a reference placed before its figure works too—something the MathJax trick it replaces never managed.
See also {{figlabel}}.