Existing titles containing characters forbidden by the current title blacklist, extracted from http://download.wikimedia.org/enwiki/20080425/enwiki-20080425-all-titles-in-ns0.gz. Does not include whitelisted single-character titles or titles matching the more complicated regexps in the blacklist. Only the codepoint of the first matching character in each title is shown. The specific regexps checked are:

.*[ℂ℃℄ℇ℈℉ℊℋℌℍℎℏℐℑℒℓℕ℗℘ℙℚℛℜℝ℞℟℣ℤℨ℩ℬℭ℮ℯℰℱℲℳℴℹ℺⅁⅂⅃⅄ⅅⅆⅇⅈⅉⅎ].* # Some letterlike symbols (excluding Kelvin, Angstrom and Ohm signs, see talk)
.*[\x{249C}-\x{24E9}].* # Circled and parenthesized Latin letters
.*[\x{FF21}-\x{FF3A}\x{FF41}-\x{FF5A}].* # Fullwidth Latin letters
.*[?ʖ؟ʔ].* # Question mark lookalikes, used for page move vandalism
.*[\x{00A0}\x{2002}-\x{200B}\x{3000}].*  # Non-breaking and other unusual spaces
.*[\x{202A}-\x{202E}].* # BiDi overrides
.*[^\P{So}¦§©®°¶№™☀-⚲✁-➾].* # "Other punctuation", with some exceptions (may need more, this is a huge character class)
.*\p{Cc}.* # Control characters
.*\x{FEFF}.* # Byte order mark
U+0081 () in Alien³
U+0081 () in Ranma_½
U+0082 (‚) in ‚¬
U+0083 (ƒ) in Fátima,_Portugal
U+0083 (ƒ) in Joan_Enric_Vives_Sicília
U+0083 (ƒ) in SNCF_line_Grenoble-Montmélian
U+008D () in Amakusa_Shirō
U+0092 (’) in Krapp’s_Last_Tape
U+0098 (˜) in Øystein_Aarseth
U+009A (š) in Beneš_decrees
U+009C (œ) in Basilica_of_the_Sacré_Cœur
U+009F (Ÿ) in Phở
U+00A0 ( ) in 10 000_lépés
U+00A0 ( ) in 15 September
U+00A0 ( ) in 1 August
U+00A0 ( ) in 20 mm_caliber
U+00A0 ( ) in 24 December
U+00A0 ( ) in 31 December
U+00A0 ( ) in 50 cc
U+00A0 ( ) in 7_Tage -_7_Köpfe
U+00A0 ( ) in 8 mm
U+00A0 ( ) in 9 mm_Luger
U+00A0 ( ) in Abu Musab al-Zarqawi
U+00A0 ( ) in Agusan del Norte
U+00A0 ( ) in Agusan del Sur
U+00A0 ( ) in A priori
U+00A0 ( ) in Antigua and Barbuda
U+00A0 ( ) in Antique (province)
U+00A0 ( ) in Aurora (province)
U+00A0 ( ) in BBC_Radio 2
U+00A0 ( ) in Bill_Haley &_His_Comets
U+00A0 ( ) in Binary_alphabet 
U+00A0 ( ) in Bob_Marley &_the_Wailers
U+00A0 ( ) in Bofors_40 mm_gun
U+00A0 ( ) in Bohemond_II of_Antioch
U+00A0 ( ) in Brenda Edwards
U+00A0 ( ) in Broken/ 
U+00A0 ( ) in Bruce_Springsteen &_the_E-Street_Band
U+00A0 ( ) in Buddy_Holly &_the_Crickets
U+00A0 ( ) in Camarines Norte
U+00A0 ( ) in Camarines Sur
U+00A0 ( ) in Campesinos 
U+00A0 ( ) in Cassie Compton
U+00A0 ( ) in Centennial Olympic Park
U+00A0 ( ) in Chrysler L_platform
U+00A0 ( ) in CINEMA 4D
U+00A0 ( ) in Città_del_vaticano
U+00A0 ( ) in Clovis I
U+00A0 ( ) in Compostela Valley
U+00A0 ( ) in Creek /_Muskogee_language
U+00A0 ( ) in C.S. Peirce
U+00A0 ( ) in Dale Weightman
U+00A0 ( ) in Davao del Norte
U+00A0 ( ) in Davao del Sur
U+00A0 ( ) in Davao Oriental
U+00A0 ( ) in December 24
U+00A0 ( ) in DICRO Oy
U+00A0 ( ) in Directive_96/9/EC_of_the_European_Parliament_and_of_the_Council_of_11 March_1996_on_the_Legal_Protection_of_Databases
U+00A0 ( ) in Don Bosco Technical Institute, Tarlac
U+00A0 ( ) in Downtown Oakland
U+00A0 ( ) in Dr._Peter_Johnsen,_Provost_Bradley_University 
U+00A0 ( ) in Eastern Samar
U+00A0 ( ) in El Cortez
U+00A0 ( ) in En-anna-tum I
U+00A0 ( ) in Eugene Goossens
U+00A0 ( ) in Exploding whale
U+00A0 ( ) in Flight international
U+00A0 ( ) in Gene_Vincent &_His_Blue_Caps
U+00A0 ( ) in Handley_Page HP.88
U+00A0 ( ) in Hank_Ballard &_the_Midnighters
U+00A0 ( ) in Hell's Kitchen
U+00A0 ( ) in Hurricane Katrina
U+00A0 ( ) in Ilocos Norte
U+00A0 ( ) in Ilocos Sur
U+00A0 ( ) in Isabela (province)
U+00A0 ( ) in Islam_inRepublic of China_(Taiwan)
U+00A0 ( ) in Jean-Jack Queyranne
U+00A0 ( ) in Jekyll Island
U+00A0 ( ) in J. R. R. Tolkien
U+00A0 ( ) in John_Alexander Cockburn
U+00A0 ( ) in John_Greeley Jenkins
U+00A0 ( ) in July 7
U+00A0 ( ) in KGWC 14/KGWL 5
U+00A0 ( ) in Koenigsegg ccR
U+00A0 ( ) in Kondwani Chiwina
U+00A0 ( ) in Lake Lanier Islands
U+00A0 ( ) in Lanao del Norte
U+00A0 ( ) in Lanao del Sur
U+00A0 ( ) in La Union
U+00A0 ( ) in Larry Wall
U+00A0 ( ) in Lieutenant Governor_of_California
U+00A0 ( ) in Lieutenant Governor_of_Florida
U+00A0 ( ) in Los Fugitivos
U+00A0 ( ) in Louis_Jordan &_His_Tympany_Five
U+00A0 ( ) in Mac OS X
U+00A0 ( ) in Ma_Rainey &_Her_Tub_Jug_Washboard_Band
U+00A0 ( ) in Mark_16/1_triple_6 in_/47_Turret
U+00A0 ( ) in Misamis Occidental
U+00A0 ( ) in Misamis Oriental
U+00A0 ( ) in Mountain Province
U+00A0 ( ) in  ~
U+00A0 ( ) in  ,
U+00A0 ( ) in  Species:_The_Awakening
U+00A0 ( ) in Negros Occidental
U+00A0 ( ) in Negros Oriental
U+00A0 ( ) in Northern Samar
U+00A0 ( ) in Nueva Ecija
U+00A0 ( ) in Nueva Vizcaya
U+00A0 ( ) in Occidental Mindoro
U+00A0 ( ) in Organizational_dimensions_of_information 
U+00A0 ( ) in Oriental Mindoro
U+00A0 ( ) in Oxpheneridine (Carbamethidine)
U+00A0 ( ) in Panjabi /_Punjabi_language
U+00A0 ( ) in Revolutionary Alliance
U+00A0 ( ) in Shariff Kabunsuan
U+00A0 ( ) in Short-tailed_Grasswren     
U+00A0 ( ) in Society_of_St. Francis_de_Sales
U+00A0 ( ) in Southern Leyte
U+00A0 ( ) in South Carolina
U+00A0 ( ) in South Cotabato
U+00A0 ( ) in South Harbor_(RTA_Rapid_Transit_station)
U+00A0 ( ) in Sq mi
U+00A0 ( ) in St. Martin's_Lane
U+00A0 ( ) in St Petersburg
U+00A0 ( ) in Sultan Kudarat_(province)
U+00A0 ( ) in Surigao del Sur
U+00A0 ( ) in Surigao del_Norte
U+00A0 ( ) in The Lovin'_Spoonful
U+00A0 ( ) in Thomas_à_Kempis
U+00A0 ( ) in Tom_Petty &_the_Heartbreakers
U+00A0 ( ) in Universum Bremen
U+00A0 ( ) in Waray-Waray /_Samar-Leyte_Visayan_language
U+00A0 ( ) in Wasp waist
U+00A0 ( ) in Wayne Campbell
U+00A0 ( ) in WBAN-LP 20
U+00A0 ( ) in Welsh Assembly
U+00A0 ( ) in White_Dragon (England)
U+00A0 ( ) in William_R._Brownfield 
U+00A0 ( ) in WLLB-LP 15
U+00A0 ( ) in Yôko_Shimomura_ 
U+00A0 ( ) in Zamboanga del Norte
U+00A0 ( ) in Zamboanga del Sur
U+00A0 ( ) in Zamboanga Sibugay
U+2003 ( ) in Switzerland                                                                               
U+200B (​) in Bampaku-​kinenkōen_Station
U+200B (​) in Chūkyō-​keibajō-mae_Station
U+200B (​) in Dangkor​
U+200B (​) in Daughter​_of​_Twenty​_Faces
U+200B (​) in Daun_Penh​_​​​
U+200B (​) in Hakaba​_Kitaro​
U+200B (​) in Kashiwanoha-​campus_Station
U+200B (​) in Kashiwa-​Tanaka_Station
U+200B (​) in Nagareyama-​centralpark_Station
U+200B (​) in Non_​Newtonian_fluid
U+200B (​) in Okazakikōen-​mae_Station
U+200B (​) in Prampir_Makara_​
U+200B (​) in The​_Daughter​_of​_Twenty​_Faces
U+200B (​) in The​_Daughter​_of​_Twenty​_Faces​
U+202A (‪) in ‪‫‬‭‮‪‫‬‭‪‫‬‭‮‪‫‬‭‮҉
U+202A (‪) in ‪Norsk_(bokmål)
U+202B (‫) in Rodent's_revenge‫‬‭‮‪‫‬‭‮
U+202D (‭) in الملك‭_‬الظاهر‭_‬ركن‭_‬الدين‭_‬بيبرس‭_‬البندقداري
U+2103 (℃) in ℃-ute
U+2103 (℃) in ℃ute
U+2103 (℃) in ℃-UTE
U+2103 (℃) in ℃UTE
U+2113 (ℓ) in Mℓ
U+2118 (℘) in Weierstraß_℘_function
U+212E (℮) in ℮_(mathematical_constant)
U+241D (␝) in Apple_II␝
U+25B6 (▶) in Tour_00_▶▶_01_Macabre
U+25C6 (◆) in Gato_negro◆Dragón_rojo
U+25C7 (◇) in FANATIC◇CRISIS
U+3000 ( ) in キングダムハーツ チェインオブメモリーズ
U+3000 ( ) in CoCo ココ
U+3000 ( ) in Dreamcast_Express_Extra_(ドリームキャスト エクスポレス エクストラ)
U+3000 ( ) in Engaku-ji 
U+3000 ( ) in F Zero_X
U+3000 ( ) in HOT_TIME/A._  ~answer~
U+3000 ( ) in HOT_TIME/A.  ~Answer~
U+3000 ( ) in Hyōtan-yama_Station (Kintetsu)
U+3000 ( ) in Love_Me 千面女孩
U+3000 ( ) in Mampuku-ji 
U+3000 ( ) in Shokoku-ji 
U+3000 ( ) in Takase_River (Kyoto)
U+3000 ( ) in Tick!_Tack! -Never_Say_Goodbye-
U+3000 ( ) in Umetaro Suzuki
U+3000 ( ) in Vimalakīrti Sutra
U+3000 ( ) in 國父 孫中山先生
U+3000 ( ) in 地下幻燈劇画 少女椿
U+3000 ( ) in スクールランブル ニ学期
U+3000 ( ) in たったひとりの最終決戦 〜フリーザに挑んだZ戦士孫悟空の父〜
U+3000 ( ) in 森 理世
U+3000 ( ) in 爆裂クイズ 魔Q大冒険
U+3000 ( ) in 犬塚 キバ
U+3000 ( ) in 胸いっぱいのこの愛を 誰より君に
U+3000 ( ) in 財団法人 日本自転車競技連盟
U+FEFF () in 13_Lake
U+FEFF () in La_Chaux_(Switzerland)
U+FEFF () in Q:_Are_We_Not_Men?_A:_We_Are_Devo!
U+FEFF () in Sp_z_o.o.
U+FEFF () in The_Gargoyle_of_the_Yoshinagas
U+FF1F (?) in Shall_we_ダンス?
U+FF22 (B) in Bannan Line (TRTS)
U+FF23 (C) in 君達の基地は、全てCATSがいただいた
U+FF27 (G) in GOL1907
U+FF2A (J) in JAL907
U+FF2A (J) in ワンダープロジェクトJ機械の少年ピーノ
U+FF2D (M) in MADOX-01
U+FF2D (M) in いつだってMyサンタ!
U+FF2D (M) in Maokong Gondola
U+FF30 (P) in Pingtung County
U+FF31 (Q) in ウルトラQ
U+FF31 (Q) in Qコちゃん
U+FF31 (Q) in QコちゃんTHE地球侵略少女
U+FF34 (T) in Taipei Main Station
U+FF34 (T) in Sea_Turtle_Association_of_Japan,_Kuroshima_Research_Station
U+FF38 (X) in 謎の彼女X
U+FF53 (s) in Ten_Dreams
U+FF53 (s) in Tokyo-daigaku_sougoh_kenkyu-jyo_Hakubutsukann_Koishikawa_bunninn