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Subset : a horizontal "U" on top of a horizontal "I"
E: I think it means summation
Universal set: capital "U"
Null set: we can use either a {} or a 0 with a slanting line through it 

(not really sure if these are the answers you're looking for but I tried)

..... lol :)
0 0 0
Subset:"C" with a underline in it
Universal set: big "u"( ganyan din ang itsura)
Null Set:{ } or O with a line in the centar
0 0 0
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