wiki-list of SID codes:
http://wiki.redump.org/index.php?title=List_of_SID_codes

IFPI SID codes
https://www.ifpi.org/content/library/sid-code-implementation-guide.pdf

http://select45rpm.com/pages/originals.html

https://www.discogs.com/help/doc/mp-grading

https://www.discogs.com/forum/thread/743281
https://support.discogs.com/en/support/solutions/articles/13000014661-how-can-i-format-text-

[[X]]

https://manytools.org/facebook-twitter/strikethrough-text/

https://www.piliapp.com/cool-text/strikethrough-text/

Some useful signs http://www.suave.net/~dave/unicode.pl

https://blog.kupiku.com/en/kupiku/japanese-cds-10-things-to-know/

•·
⊂⊃ ⩇
℗ © ® Θ € ƒ „“ … † ‡ ˆ ‰ ‹› – — ¯
× ¡ ¢ £ ¤ ¥ ¦ § ¨ " ¬ ± α œ › Œ
µ ¶ ◦ • · ´¸ ´ " ½ ¼ Þ № ™ ¿
■ ▼ ▲ ◄ ► ◬ ∆ Δ∇ △▽ Λ ∧∨ ⊲⊳ ◁▷ ⊴⊵
◣◢ ◤◥ ↕ ↔ ↑ ↓ → ← ↗ ↙ ↖ ↘ ↯ ◇ ◊
☂ ⁂ ☃ ☠ ☯ ☮ ☼ ☆ ♪ ♫ ♬ ✳ ✶ ○ º
♂ ♀ ☢ ☺ ☹ ☻ ⦿ » « » « ♡ ♥ ♦ ♣ ♠
∟ ^ ◠ ◡ ╯ ⌂ ¢ ₧ Γ σ ¬ 0 ∩ ∫ Φ √ Ø

✽✠✡✢✣✤✥✦✧✩✪✫✬✭✮✯✰✱✲✳✴✵✶✷✸✹✺✻✼✽✾✿ ❀ ❁ ❂ ❃ ❄ ❅ ❆ ❇ ❈ ❉ ❊ ❋ ❖ ❤ ★ ☆
♠ ♡ ♢ ♣ ♤ ♥ ♦ ♧ ♩ ♪ ♫ ♬ ♭ ♮ ♯ ✌ ✙ ✚ ✛ ✜ ✝ ✞ ✟
⅓ ⅔ ⅕ ⅖ ⅗ ⅘ ⅙ ⅚ ⅛ ⅜ ⅝ ⅞

∗ ᴗ ᴖ ℗ © ® ™ ፨ · • ◬ № ◅ ▻ ◦ Ⓜ 〄 Ⓟ Ⓤ ⓤ ⋉ ⍺ ☮ ½ 〈〉ᴝ ౧ ᴒ ᴧ
A̶B̶C̶D̶E̶F̶G̶H̶I̶J̶K̶L̶M̶N̶O̶P̶Q̶R̶S̶T̶U̶V̶W̶X̶Y̶Z̶Æ̶Ø̶Å̶ ̶1̶2̶3̶4̶5̶6̶7̶8̶9̶0̶

⁰¹²³⁴⁵⁶⁷⁸⁹ ₀₁₂₃₄₅₆₇₈₉ ⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹

⓪①②③④⑤⑥⑦⑧⑨⑩⑪⑫⑬⑭⑮⑯⑰⑱⑲⑳
⓵⓶⓷⓸⓹⓺⓻⓼⓽⓾⓫⓬⓭⓮⓯⓰⓱⓲⓳⓴
ⒶⒷⒸⒹⒺⒻⒼⒽⒾⒿⓀⓁⓂⓃⓄⓅⓆⓇⓈⓉⓊⓋⓌⓍⓎⓏ
ⓐⓑⓒⓓⓔⓕⓖⓗⓘⓙⓚⓛⓜⓝⓞⓟⓠⓡⓢⓣⓤⓥⓦⓧⓨⓩ

Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ Ⅶ Ⅷ Ⅸ Ⅹ Ⅺ Ⅻ

SACEM SDRM SACD SGDL

Common runout groove etchings: how to list them (Version 6)
https://www.discogs.com/forum/thread/743281

Image order guidelines: https://support.discogs.com/hc/en-us/articles/360005006874-Database-Guidelines-13-Images#13.8

Welcome to the Master List of runout information - version 8
https://www.discogs.com/forum/thread/810326
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