a next beta will have
\definesymbol [bullet] [\textormathchar{"2022}] % • \bullet \definesymbol [dash] [\textormathchar{"2013}] % – \definesymbol [star] [\textormathchar{"22C6}] % ✴ \star \definesymbol [triangle] [\textormathchar{"22B3}] % ⊳ \triangleright \definesymbol [circle] [\textormathchar{"2218}] % ∘ \circ \definesymbol [square] [\textormathchar{"25A1}] % □ \square \definesymbol [diamond] [\textormathchar{"22C4}] % ⋄ \diamond \definesymbol [checkmark] [\textormathchar{"2713}] % ✓ \checkmark
\definesymbol [blacktriangle] [\textormathchar{"25B6}] % ▶ \definesymbol [blacksquare] [\textormathchar{"25A0}] % ■ \definesymbol [blackdiamond] [\textormathchar{"25C6}] % ◆
but it's experimental (and fonts like cambria don't have all of them)
Thanks Hans, \startsymbolset and \setupsymbolset are very convenient to quickly change between different sets of symbols. Florian