critical in Wingdings is ♍︎❒︎♓︎⧫︎♓︎♍︎♋︎●︎

Pertaining to, or indicating, a crisis, turning point, orspecially important juncture; important as regards consequences;hence, of doubtful issue; attended with risk; dangerous; as, thecritical stage of a fever; a critical situation.Our circumstances are indeed critical. Burke.The small moment, the exact point, the critical minute, on whichevery good work so much depends. South.Critical angle (Optics), that angle of incidence of a luminous ray atwhich it is wholly reflected, and no portion of it transmitted. Thesine of this angle is the reciprocal of the refractive index of themedium.-- Critical philosophy, the metaphysical system of Kant; -- socalled from his most important work, the "Critique of Pure Reason." -- Critical point (Physics), a certain temperature, different fordifferent gases, but always the same for each gas, regarded as thelimit above which no amount of pressure can produce condensation to aliquid.