This question arised as part of the discussion here.
At first (see entry 1. here) I thought that 表外{ひょうがい} (hyōgai) was a label for any kanji that is outside the 常用{じょうよう} (jōyō) list. However, in this Wikipedia article they suggest that hyōgai does not include 人名用{じんめいよう} (jinmeiyō) kanji either. Which is the case? Maybe there is no unique, exact definiton of hyōgai?
Thank you in advance.
The term 表外漢字 has somewhat different usage in technical sense and everyday parlage.
Strictly speaking, there are 1'022 official 表外漢字. They are those designated by the National Language Council of Japan (国語審議会) in year 2000, delineated in this table: 1 (see also 2; source: 3).
As it is easy to observe, some of these are even 常用, to say nothing of 人名用. But this is obviously by design, as these 常用 and 人名用 characters (such as 挨 for 常用 and 葦 for 人名用) were added to the corresponding lists later, after being highlighted for the 表外漢字 list before. In total, out of 1'022 characters, 151 went into 常用 wholesale:
挨󠄀宛󠄀闇󠄀椅󠄀畏󠄀萎󠄀咽󠄀臼󠄀怨󠄀岡󠄀臆󠄀俺󠄀苛󠄀崖󠄀蓋󠄀骸󠄀柿󠄀顎󠄀瓦󠄀韓󠄀玩󠄀畿󠄀巾󠄀串󠄀窟󠄀稽󠄀詣󠄀桁󠄀舷󠄀股󠄀乞󠄀勾󠄀喉󠄀頃󠄀痕󠄀挫󠄀塞󠄀阪󠄀埼󠄀柵󠄀拶󠄀斬󠄀嫉󠄀腫󠄀呪󠄀蹴󠄀拭󠄀尻󠄀芯󠄀腎󠄀裾󠄀凄󠄀醒󠄀戚󠄀脊󠄀羨󠄀腺󠄀膳󠄀狙󠄀捉󠄀袖󠄀唾󠄀堆󠄀戴󠄀誰󠄀綻󠄀酎󠄀潰󠄀爪󠄀諦󠄀貼󠄀妬󠄀栃󠄀頓󠄀鍋󠄀匂󠄀捻󠄀罵󠄀斑󠄀氾󠄀汎󠄀膝󠄀肘󠄀阜󠄀蜂󠄀貌󠄀勃󠄀昧󠄀枕󠄀蜜󠄀冥󠄀妖󠄀沃󠄀侶󠄀賂󠄀弄󠄀麓󠄀脇󠄀丼󠄀傲󠄀刹󠄀哺󠄀喩󠄀嗅󠄀毀󠄀彙󠄀恣󠄀惧󠄀慄󠄀拉󠄀曖󠄀鬱󠄀璧󠄀瘍󠄀箋󠄀籠󠄀緻󠄀羞󠄀訃󠄀諧󠄀貪󠄀踪󠄀辣󠄀淫󠄁葛󠄁僅󠄁煎󠄁詮󠄁遡󠄁遜󠄁捗󠄁溺󠄁塡󠄀賭󠄁謎󠄁剝󠄀箸󠄁蔽󠄁頰󠄀餅󠄁嘲󠄁茨󠄁牙󠄁餌󠄃𠮟󠄀蔑󠄁摯󠄁隙󠄁鍵󠄁梗󠄁釜󠄁
357 were borrowed for 人名用:
葦󠄀斡󠄀或󠄀粟󠄀庵󠄀按󠄀鞍󠄀夷󠄀謂󠄀蔭󠄀烏󠄀鵜󠄀窺󠄀碓󠄀姥󠄀瓜󠄀閏󠄀云󠄀曳󠄀榎󠄀堰󠄀奄󠄀燕󠄀甥󠄀荻󠄀桶󠄀牡󠄀珂󠄀蝦󠄀嘩󠄀俄󠄀峨󠄀臥󠄀駕󠄀芥󠄀蟹󠄀鎧󠄀笠󠄀樫󠄀梶󠄀恰󠄀兜󠄀蒲󠄀鴨󠄀萱󠄀粥󠄀柑󠄀竿󠄀雁󠄀掬󠄀杵󠄀鋸󠄀蕎󠄀禽󠄀寓󠄀釧󠄀沓󠄀窪󠄀隈󠄀鍬󠄀戟󠄀訣󠄀喧󠄀牽󠄀硯󠄀乎󠄀糊󠄀袴󠄀跨󠄀醐󠄀庚󠄀杭󠄀腔󠄀膏󠄀閤󠄀劫󠄀壕󠄀轟󠄀忽󠄀惚󠄀此󠄀昏󠄀些󠄀坐󠄀犀󠄀砦󠄀堺󠄀肴󠄀鷺󠄀窄󠄀晒󠄀撒󠄀珊󠄀纂󠄀讃󠄀仔󠄀斯󠄀獅󠄀而󠄀竺󠄀雫󠄀悉󠄀篠󠄀柴󠄀縞󠄀錫󠄀惹󠄀蒐󠄀輯󠄀嘗󠄀湘󠄀裳󠄀埴󠄀燭󠄀壬󠄀諏󠄀厨󠄀錐󠄀菅󠄀頗󠄀雀󠄀棲󠄀栖󠄀蹟󠄀尖󠄀閃󠄀曾󠄀楚󠄀疏󠄀蘇󠄀叢󠄀宋󠄀槍󠄀漕󠄀其󠄀舵󠄀楕󠄀陀󠄀苔󠄀醍󠄀托󠄀茸󠄀凧󠄀竪󠄀坦󠄀湛󠄀耽󠄀弛󠄀馳󠄀筑󠄀喋󠄀寵󠄀帖󠄀牒󠄀佃󠄀柘󠄀綴󠄀梯󠄀蹄󠄀釘󠄀鼎󠄀纏󠄀砥󠄀套󠄀宕󠄀撞󠄀萄󠄀鳶󠄀沌󠄀薙󠄀馴󠄀汝󠄀賑󠄀廿󠄀濡󠄀播󠄀杷󠄀琶󠄀芭󠄀煤󠄀柏󠄀箔󠄀曝󠄀莫󠄀函󠄀筈󠄀幡󠄀畠󠄀磐󠄀蕃󠄀庇󠄀枇󠄀毘󠄀琵󠄀疋󠄀菱󠄀畢󠄀紐󠄀瓢󠄀撫󠄀葡󠄀蕪󠄀葺󠄀淵󠄀吻󠄀焚󠄀頁󠄀圃󠄀戊󠄀菩󠄀捧󠄀鋒󠄀卜󠄀殆󠄀幌󠄀俣󠄀沫󠄀蔓󠄀箕󠄀湊󠄀蓑󠄀牟󠄀姪󠄀蒙󠄀勿󠄀尤󠄀貰󠄀輿󠄀傭󠄀淀󠄀螺󠄀洛󠄀裡󠄀掠󠄀劉󠄀溜󠄀梁󠄀淋󠄀鱗󠄀憐󠄀魯󠄀櫓󠄀狼󠄀肋󠄀鷲󠄀詫󠄀藁󠄀蕨󠄀椀󠄀碗󠄀凰󠄀巫󠄀已󠄀檜󠄀橙󠄀櫂󠄀渾󠄀煌󠄀絆󠄀蕾󠄀逞󠄀釉󠄀溢󠄁鰯󠄁迂󠄁噂󠄁焰󠄀襖󠄁鷗󠄀迦󠄁晦󠄁鞄󠄁徽󠄁祇󠄁俠󠄀卿󠄂喰󠄁櫛󠄀屑󠄁祁󠄁繫󠄀倦󠄁捲󠄁諺󠄁巷󠄁榊󠄁薩󠄁錆󠄁灼󠄁繡󠄀哨󠄁蔣󠄀醬󠄀鞘󠄁逗󠄁摺󠄁蟬󠄀撰󠄁噌󠄁辿󠄁樽󠄁簞󠄀註󠄁槌󠄁摑󠄀鄭󠄁擢󠄁顚󠄀堵󠄁禱󠄀灘󠄁楢󠄁禰󠄁這󠄁秤󠄁挽󠄁樋󠄁廟󠄁瀕󠄁瞥󠄁娩󠄁蓬󠄁鱒󠄁儲󠄁萊󠄀漣󠄀煉󠄀蠟󠄀汲󠄁饗󠄁穿󠄁揃󠄁篇󠄁迄󠄁逢󠄁辻󠄁楯󠄁廻󠄁俱󠄀訊󠄁瘦󠄀歎󠄁兎󠄁吞󠄀豹󠄁笈󠄂簾󠄂恢󠄂灸󠄁厩󠄅叉󠄁杖󠄁挺󠄁遁󠄂斧󠄁鞭󠄁籾󠄂
and only 514 were not used to supplement the main list (as of yet). Among those, 14 are traditional forms of simplified characters:
儘󠄀壺󠄀攪󠄀檮󠄀濤󠄀灌󠄀藪󠄀蠣󠄀諫󠄀賤󠄀邇󠄀頸󠄀鰺󠄀鶯󠄀
the rest are not:
虻󠄀鰻󠄀嬰󠄀洩󠄀穎󠄀厭󠄀蛾󠄀咳󠄀蛙󠄀廓󠄀橿󠄀鰹󠄀姦󠄀桓󠄀澗󠄀癌󠄀贋󠄀妓󠄀蟻󠄀吃󠄀仇󠄀渠󠄀僑󠄀怯󠄀狗󠄀珪󠄀畦󠄀荊󠄀姑󠄀狐󠄀菰󠄀垢󠄀糠󠄀濠󠄀漉󠄀鮭󠄀捌󠄀屍󠄀痔󠄀綬󠄀讐󠄀鋤󠄀妾󠄀娼󠄀鉦󠄀鍾󠄀擾󠄀疹󠄀塵󠄀笥󠄀趨󠄀脆󠄀鼠󠄀鐸󠄀叩󠄀狸󠄀蛋󠄀蜘󠄀諜󠄀銚󠄀吊󠄀剃󠄀碇󠄀轍󠄀澱󠄀淘󠄀蕩󠄀禿󠄀苫󠄀韮󠄀葱󠄀撚󠄀膿󠄀覗󠄀蚤󠄀狽󠄀粕󠄀筏󠄀噺󠄀蛤󠄀髭󠄀蛭󠄀鮒󠄀扮󠄀糞󠄀僻󠄀呆󠄀鉾󠄀吠󠄀鵡󠄀牝󠄀悶󠄀涌󠄀熔󠄀燐󠄀牢󠄀聾󠄀歪󠄀鰐󠄀乖󠄀于󠄀亢󠄀仄󠄀佇󠄀侘󠄀俤󠄀俯󠄀偈󠄀冑󠄀几󠄀剋󠄀匈󠄀卉󠄀曼󠄀吼󠄀呵󠄀咎󠄀呟󠄀呻󠄀咄󠄀咸󠄀咤󠄀哭󠄀啜󠄀啖󠄀唸󠄀喀󠄀喘󠄀啼󠄀嗚󠄀嗟󠄀嗜󠄀嘔󠄀嘴󠄀嚥󠄀囁󠄀囃󠄀址󠄀埃󠄀埒󠄀墟󠄀壙󠄀奢󠄀奸󠄀娑󠄀婉󠄀娶󠄀媚󠄀嬌󠄀孕󠄀孵󠄀宦󠄀宸󠄀寥󠄀尹󠄀屁󠄀屎󠄀屹󠄀峙󠄀崗󠄀嵌󠄀帚󠄀帛󠄀帷󠄀幟󠄀廂󠄀廬󠄀彎󠄀彷󠄀徊󠄀恍󠄀悍󠄀悸󠄀愕󠄀憚󠄀憑󠄀憫󠄀罹󠄀懺󠄀懼󠄀戌󠄀截󠄀戮󠄀抉󠄀抒󠄀拗󠄀拿󠄀拮󠄀捏󠄀掟󠄀揆󠄀揉󠄀揶󠄀揄󠄀撥󠄀攀󠄀攘󠄀攣󠄀敲󠄀斃󠄀旱󠄀晰󠄀暈󠄀曠󠄀曰󠄀朦󠄀朧󠄀杣󠄀枡󠄀柩󠄀梵󠄀棘󠄀椒󠄀棹󠄀楔󠄀楮󠄀楡󠄀槃󠄀榜󠄀榴󠄀檻󠄀櫃󠄀櫟󠄀欅󠄀殷󠄀毫󠄀毯󠄀沁󠄀泄󠄀洒󠄀浙󠄀涅󠄀涵󠄀涸󠄀滓󠄀漑󠄀漿󠄀滲󠄀瀑󠄀濾󠄀瀾󠄀炒󠄀炬󠄀炸󠄀焉󠄀熾󠄀燵󠄀爛󠄀爬󠄀猥󠄀瑕󠄀疆󠄀疇󠄀疵󠄀疽󠄀疸󠄀疱󠄀痒󠄀痙󠄀痰󠄀痺󠄀瘡󠄀瘤󠄀瘻󠄀癬󠄀皺󠄀盂󠄀眩󠄀睨󠄀睫󠄀睾󠄀瞑󠄀瞞󠄀瞰󠄀瞼󠄀砒󠄀磋󠄀礫󠄀祀󠄀祠󠄀祟󠄀祓󠄀禊󠄀穢󠄀窩󠄀竦󠄀箒󠄀箏󠄀篆󠄀簀󠄀籬󠄀紮󠄀絨󠄀絣󠄀綽󠄀罠󠄀翅󠄀翳󠄀耆󠄀聊󠄀聘󠄀聚󠄀聳󠄀肛󠄀胚󠄀胱󠄀脛󠄀腋󠄀隋󠄀脾󠄀腑󠄀膀󠄀膠󠄀膣󠄀膵󠄀臀󠄀臂󠄀臍󠄀臘󠄀舅󠄀舐󠄀芻󠄀苞󠄀茫󠄀莢󠄀荼󠄀萼󠄀蓼󠄀薨󠄀蕭󠄀薔󠄀薇󠄀蘆󠄀蛉󠄀蛛󠄀蜀󠄀蜻󠄀蝸󠄀雖󠄀蟇󠄀衙󠄀袁󠄀袂󠄀袢󠄀裔󠄀褌󠄀褥󠄀襞󠄀襦󠄀襷󠄀訛󠄀訶󠄀誅󠄀誦󠄀諤󠄀諱󠄀謔󠄀諷󠄀謗󠄀謳󠄀譚󠄀賽󠄀贄󠄀贅󠄀趙󠄀趾󠄀跏󠄀跋󠄀踵󠄀蹊󠄀躁󠄀躇󠄀躊󠄀躬󠄀軋󠄀轢󠄀逍󠄀遽󠄀邁󠄀邱󠄀鄙󠄀鈔󠄀鉗󠄀鉤󠄀鋏󠄀鍼󠄀閨󠄀閻󠄀閾󠄀闊󠄀闍󠄀陝󠄀隕󠄀隧󠄀雉󠄀霰󠄀靄󠄀勒󠄀鞋󠄀韋󠄀竟󠄀頷󠄀頽󠄀顆󠄀飫󠄀饉󠄀饅󠄀饒󠄀髷󠄀髻󠄀鬘󠄀鬚󠄀鬢󠄀魏󠄀鮨󠄀鰓󠄀鰊󠄀鸚󠄀鸞󠄀靡󠄀齟󠄀齬󠄀啞󠄀飴󠄁嚙󠄀翰󠄁翫󠄁軀󠄀鹼󠄀麴󠄀鵠󠄁鯖󠄁屢󠄀杓󠄁酋󠄁薯󠄁藷󠄁蝕󠄁搔󠄀驒󠄀腿󠄁蛸󠄁瀦󠄁鎚󠄁屠󠄁瀆󠄀瀞󠄁囊󠄀牌󠄁潑󠄀醱󠄀稗󠄁逼󠄁謬󠄁庖󠄁麵󠄀鑓󠄁愈󠄁榔󠄁冤󠄁屛󠄀攢󠄀噓󠄀餐󠄁煽󠄂箭󠄁叛󠄁扁󠄁篝󠄁騙󠄁﨟󠄀鄧󠄀誹󠄁徘󠄁靱󠄂猷󠄂叟󠄁囀󠄁艘󠄁鴉󠄁姸󠄀幷󠄀疼󠄁筵󠄁甕󠄂訝󠄂粂󠄁虔󠄁腱󠄁咬󠄁狡󠄁鮫󠄁甦󠄁甑󠄃竈󠄁駁󠄁芒󠄁爺󠄁蠅󠄂蜃󠄁
In everyday usage, however, the term 表外漢字 refers to any kanji "outside (外) some list (表)." It may refer to non-常用, to non-当用, non-(常用+人名用) characters based on context. However, most typically this covers both the 常用 and 人名用 lists together.
Note that 外字 is a somewhat different concept, referring to characters not covered by some electronic character set (such as JIS X 0208) or a specific font and thus requiring to use hacks instead of just coding the characters.
