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Converts a number from 0 to 50 to a single Unicode character consisting of the number inside a circle.

This is intended for use in category sortkeys, since categories display a group header for each initial character.

There is only one parameter, |1=, which must be a number from 0 to 50

+0	+1	+2	+3	+4	+5	+6	+7	+8	+9
⓪	①	②	③	④	⑤	⑥	⑦	⑧	⑨
⑩	⑪	⑫	⑬	⑭	⑮	⑯	⑰	⑱	⑲
⑳	㉑	㉒	㉓	㉔	㉕	㉖	㉗	㉘	㉙
㉚	㉛	㉜	㉝	㉞	㉟	㊱	㊲	㊳	㊴
㊵	㊶	㊷	㊸	㊹	㊺	㊻	㊼	㊽	㊾
㊿