A/N: I'll add the characters and the symbol for that character as I go so this part will get updated a lot.
OS: Older Sheldon
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Ma: Mary
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Mi: Missy
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G: George
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Ge: Georgie
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C: Connie/ Meemaw
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S: Sheldon
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Y: Y/N
MME: Ms McElroy ( I couldn't find a good picture or just the homeroom clip.)
CW: Coach Wilkins
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T: Tam
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GeFs: Georgie's Friends
YM/N: Your mother's name
H: Hunter (Y/Ns Step-father)
YB/N: Your Brothers Name
YF/N: Your Fathers Name