/* symbolic constants */

[true, false, unknown, inf, minf, ind,
 und, %e, %i, %pi, %phi, %gamma];

/* built-in variables */

[_, __, %, %%, linel, simp, dispflag,
 stringdisp, lispdisp, %edispflag];

/* built-in functions */

[sin, cosh, exp, atan2, sqrt, log, struve_h,
 sublist_indices, read_array];

/* user-defined symbols */

[foo, ?bar, baz%, quux_mumble_blurf];