Uncertainty sign, also called query, a question-like mark showing doubt or an uncertain value.
U+2BD0SQUARE POSITION INDICATORU+2BD2GROUP MARKU+2BCFROTATED WHITE FOUR POINTED CUSPU+2BD3PLUTO FORM TWOU+2BCEWHITE FOUR POINTED CUSPU+2BD4PLUTO FORM THREEU+2BCDROTATED LIGHT FOUR POINTED BLACK CUSPU+2BD5PLUTO FORM FOURU+2BCCLIGHT FOUR POINTED BLACK CUSPU+2BD6PLUTO FORM FIVEU+2BCBBOTTOM HALF BLACK CIRCLEU+2BD7TRANSPLUTO254 characters in the Miscellaneous Symbols and Arrows Unicode block, from number 208.
U+2BD1UNCERTAINTY SIGNU+2BD2GROUP MARKU+2BD3PLUTO FORM TWOU+2BD4PLUTO FORM THREEU+2BD5PLUTO FORM FOURU+2BD6PLUTO FORM FIVEU+2BD7TRANSPLUTOU+2BD8PROSERPINAU+2BD9ASTRAEAU+2BDAHYGIEAU+2BDBPHOLUSU+2BDCNESSUSU+2BDDWHITE MOON SELENAU+2BDEBLACK DIAMOND ON CROSSU+2BDFTRUE LIGHT MOON ARTAU+2BE0CUPIDOU+2BE1HADESU+2BE2ZEUSU+2BE3KRONOSU+2BE4APOLLONU+2BE5ADMETOSU+2BE6VULCANUSU+2BE7POSEIDONU+2BE8LEFT HALF BLACK STARU+2BE9RIGHT HALF BLACK STARU+2BEASTAR WITH LEFT HALF BLACKU+2BEBSTAR WITH RIGHT HALF BLACKU+2BECLEFTWARDS TWO-HEADED ARROW WITH TRIANGLE ARROWHEADSU+2BEDUPWARDS TWO-HEADED ARROW WITH TRIANGLE ARROWHEADSU+2BEERIGHTWARDS TWO-HEADED ARROW WITH TRIANGLE ARROWHEADSU+2BEFDOWNWARDS TWO-HEADED ARROW WITH TRIANGLE ARROWHEADSU+2BF0ERIS FORM ONEU+2BF1ERIS FORM TWOU+2BF2SEDNAU+2BF3RUSSIAN ASTROLOGICAL SYMBOL VIGINTILEU+2BF4RUSSIAN ASTROLOGICAL SYMBOL NOVILEU+2BF5RUSSIAN ASTROLOGICAL SYMBOL QUINTILEU+2BF6RUSSIAN ASTROLOGICAL SYMBOL BINOVILEU+2BF7RUSSIAN ASTROLOGICAL SYMBOL SENTAGONU+2BF8RUSSIAN ASTROLOGICAL SYMBOL TREDECILEU+2BF9EQUALS SIGN WITH INFINITY BELOWU+2BFAUNITED SYMBOLU+2BFBSEPARATED SYMBOLU+2BFCDOUBLED SYMBOLU+2BFDPASSED SYMBOLU+2BFEREVERSED RIGHT ANGLEU+2BFFHELLSCHREIBER PAUSE SYMBOL