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Based on this website (https://www.camein.com/symbols-copy-paste.htm)
Here is a list of symbols that are compatible and appear on a KLC!

Do a direct copy and paste from the site so it copies over properly

✓,∞,★,☆,♥,♡,←,↓,→,♀,♂,ツ,✿,☂,☁,☼, ℃,℉,⚠,♨,☎,
☟,☝,☜,☞,♲,♪,♫,§,¶,«,»,[,],{,},—,–,¿,¡,‽,×,≠,¬,±,~,≈,÷,π,†,‡,€,$,¥,¢,£,ß,™,© ,®,@,½,²,★,☆,*,☀,⁂,⁑,⁂,⁑,✿,❀,♡,♥,♥️,♤,♡,♢,♧,♠,♥,♦, ♣,♩,♪,♫,♬,♭,♯,♮,∙,
▲,▼,◤,◢,◣,◥,△,▽,◁,▷,],▱,■,□,⊠,⊞,◆,◇,
█,▊,▋,▉,▇,▆,▅,▄,▃,
▢,◯,〇,⦿,⊗,⊕,◉,◎,◐,◑,◓,◒,●,○,◌,∞
√,∝,∇,∆,∅,−,±,∓,⧺,⧻,∥,∦,∫,∬,∭,∮,π,∑,∂,∀,∃,∈,∉,∋,∊, ∙,∘,
∪,∩,⊂,⊃,⊄,⊅,⊆,⊇∵,∴,≒,⊿,＝,×,⊠,⊞,⊗,⊕,⊥,
〈,〉,⌒,〄,〰️, [,.,*,+,], ~, ☁, ♠️,♡,♣️,♥️,♦️,!,@,#,$,%,^,&,*,(,),<,>,_,+,-,=,`,~,?,\,|,],},[,{,
⓪,①,②,③,④,⑤,⑥,⑦,⑧,⑨,⑩,⑪,⑫,⑬,⑭,⑮,⑯,⑰,⑱,⑲,⑳,
➀,➁,➂,➃,➄,➅,➆,➇,➈,➉,
⓿,❶,❷,❸,❹,❺,❻,❼,❽,❾,
⑴,⑵,⑶,⑷,⑸,⑹,⑺,⑻,⑼,⑽,⑾,⑿,⒀,⒁,⒂,⒃,⒄,⒅,⒆,⒇,
⒈,⒉,⒊,⒋,⒌,⒍,⒎,⒏,⒐,⒑,⒒,⒓,⒔,⒕,⒖,⒗,⒘,⒙,⒚,⒛,
⓵,⓶,⓷,⓸,⓹,⓺,⓻,⓼,⓽,⓾,
０,１,２,３,４,５,６,７,８,９,
Ⅰ,Ⅱ,Ⅲ,Ⅳ,Ⅴ,Ⅵ,Ⅶ,Ⅷ,Ⅸ,Ⅹ,Ⅺ,Ⅻ,Ⅿ,
ⅱ,ⅲ,ⅳ,ⅴ,ⅵ,ⅶ,ⅷ,ⅸ,ⅹ,ⅺ,ⅻ,ⅿ,
⁰,¹,²,³,⁴,⁵,⁶,⁷,⁸,⁹,
₀,₁,₂,₃,₄,₅,₆,₇,₈,₉,
ₐ,ₑ,ₒ,ₓ,ₔ,
⅟,½,⅓,⅔,¼,¾,⅕,⅗,⅘,⅙,⅚,⅛,⅜,⅝,⅞,%,‰,‱,
«,»,‹,›,¶,〈,〉,《,》,〔,〕,︵,︶,︷,︸,︽,︾,︹,︺,︿,﹀,<,>,＜,＞, {,},(,),｛,｝,（,）,‘,’,‛,‚,“,”,‟,„,·,•,‧,․,‥,…,′,″,‴, ‵,‶,‷,ʻ,ʼ,˜,～,＃,＆,＠,？,¿,¡,！,〝,―,—,–,‒,‑,†,‡,： ,；,*,/