256 characters in the CJK Compatibility Unicode block.
U+3300SQUARE APAATOU+3301SQUARE ARUHUAU+3302SQUARE ANPEAU+3303SQUARE AARUU+3304SQUARE ININGUU+3305SQUARE INTIU+3306SQUARE UONU+3307SQUARE ESUKUUDOU+3308SQUARE EEKAAU+3309SQUARE ONSUU+330ASQUARE OOMUU+330BSQUARE KAIRIU+330CSQUARE KARATTOU+330DSQUARE KARORIIU+330ESQUARE GARONU+330FSQUARE GANMAU+3310SQUARE GIGAU+3311SQUARE GINIIU+3312SQUARE KYURIIU+3313SQUARE GIRUDAAU+3314SQUARE KIROU+3315SQUARE KIROGURAMUU+3316SQUARE KIROMEETORUU+3317SQUARE KIROWATTOU+3318SQUARE GURAMUU+3319SQUARE GURAMUTONU+331ASQUARE KURUZEIROU+331BSQUARE KUROONEU+331CSQUARE KEESUU+331DSQUARE KORUNAU+331ESQUARE KOOPOU+331FSQUARE SAIKURUU+3320SQUARE SANTIIMUU+3321SQUARE SIRINGUU+3322SQUARE SENTIU+3323SQUARE SENTOU+3324SQUARE DAASUU+3325SQUARE DESIU+3326SQUARE DORUU+3327SQUARE TONU+3328SQUARE NANOU+3329SQUARE NOTTOU+332ASQUARE HAITUU+332BSQUARE PAASENTOU+332CSQUARE PAATUU+332DSQUARE BAARERUU+332ESQUARE PIASUTORUU+332FSQUARE PIKURUU+3330SQUARE PIKOU+3331SQUARE BIRUU+3332SQUARE HUARADDOU+3333SQUARE HUIITOU+3334SQUARE BUSSYERUU+3335SQUARE HURANU+3336SQUARE HEKUTAARUU+3337SQUARE PESOU+3338SQUARE PENIHIU+3339SQUARE HERUTUU+333ASQUARE PENSUU+333BSQUARE PEEZIU+333CSQUARE BEETAU+333DSQUARE POINTOU+333ESQUARE BORUTOU+333FSQUARE HONU+3340SQUARE PONDOU+3341SQUARE HOORUU+3342SQUARE HOONU+3343SQUARE MAIKUROU+3344SQUARE MAIRUU+3345SQUARE MAHHAU+3346SQUARE MARUKUU+3347SQUARE MANSYONU+3348SQUARE MIKURONU+3349SQUARE MIRIU+334ASQUARE MIRIBAARUU+334BSQUARE MEGAU+334CSQUARE MEGATONU+334DSQUARE MEETORUU+334ESQUARE YAADOU+334FSQUARE YAARUU+3350SQUARE YUANU+3351SQUARE RITTORUU+3352SQUARE RIRAU+3353SQUARE RUPIIU+3354SQUARE RUUBURUU+3355SQUARE REMUU+3356SQUARE RENTOGENU+3357SQUARE WATTOU+3358IDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR ZEROU+3359IDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR ONEU+335AIDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR TWOU+335BIDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR THREEU+335CIDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR FOURU+335DIDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR FIVEU+335EIDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR SIXU+335FIDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR SEVENU+3360IDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR EIGHTU+3361IDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR NINEU+3362IDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR TENU+3363IDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR ELEVENU+3364IDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR TWELVEU+3365IDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR THIRTEENU+3366IDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR FOURTEENU+3367IDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR FIFTEENU+3368IDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR SIXTEENU+3369IDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR SEVENTEENU+336AIDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR EIGHTEENU+336BIDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR NINETEENU+336CIDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR TWENTYU+336DIDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR TWENTY-ONEU+336EIDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR TWENTY-TWOU+336FIDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR TWENTY-THREEU+3370IDEOGRAPHIC TELEGRAPH SYMBOL FOR HOUR TWENTY-FOURU+3371SQUARE HPAU+3372SQUARE DAU+3373SQUARE AUU+3374SQUARE BARU+3375SQUARE OVU+3376SQUARE PCU+3377SQUARE DMU+3378SQUARE DM SQUAREDU+3379SQUARE DM CUBEDU+337ASQUARE IUU+337BSQUARE ERA NAME HEISEIU+337CSQUARE ERA NAME SYOUWAU+337DSQUARE ERA NAME TAISYOUU+337ESQUARE ERA NAME MEIZIU+337FSQUARE CORPORATIONU+3380SQUARE PA AMPSU+3381SQUARE NAU+3382SQUARE MU AU+3383SQUARE MAU+3384SQUARE KAU+3385SQUARE KBU+3386SQUARE MBU+3387SQUARE GBU+3388SQUARE CALU+3389SQUARE KCALU+338ASQUARE PFU+338BSQUARE NFU+338CSQUARE MU FU+338DSQUARE MU GU+338ESQUARE MGU+338FSQUARE KGU+3390SQUARE HZU+3391SQUARE KHZU+3392SQUARE MHZU+3393SQUARE GHZU+3394SQUARE THZU+3395SQUARE MU LU+3396SQUARE MLU+3397SQUARE DLU+3398SQUARE KLU+3399SQUARE FMU+339ASQUARE NMU+339BSQUARE MU MU+339CSQUARE MMU+339DSQUARE CMU+339ESQUARE KMU+339FSQUARE MM SQUAREDU+33A0SQUARE CM SQUAREDU+33A1SQUARE M SQUAREDU+33A2SQUARE KM SQUAREDU+33A3SQUARE MM CUBEDU+33A4SQUARE CM CUBEDU+33A5SQUARE M CUBEDU+33A6SQUARE KM CUBEDU+33A7SQUARE M OVER SU+33A8SQUARE M OVER S SQUAREDU+33A9SQUARE PAU+33AASQUARE KPAU+33ABSQUARE MPAU+33ACSQUARE GPAU+33ADSQUARE RADU+33AESQUARE RAD OVER SU+33AFSQUARE RAD OVER S SQUAREDU+33B0SQUARE PSU+33B1SQUARE NSU+33B2SQUARE MU SU+33B3SQUARE MSU+33B4SQUARE PVU+33B5SQUARE NVU+33B6SQUARE MU VU+33B7SQUARE MVU+33B8SQUARE KVU+33B9SQUARE MV MEGAU+33BASQUARE PWU+33BBSQUARE NWU+33BCSQUARE MU WU+33BDSQUARE MWU+33BESQUARE KWU+33BFSQUARE MW MEGAU+33C0SQUARE K OHMU+33C1SQUARE M OHMU+33C2SQUARE AMU+33C3SQUARE BQU+33C4SQUARE CCU+33C5SQUARE CDU+33C6SQUARE C OVER KGU+33C7SQUARE CO…and 56 more characters.