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A subset C of set B associated with the topological space B, D is said to be open if at any point c Є C there exists a positive number p such that the D-p neighborhood N(x, p) ⊂ C.

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Q: What does it mean for a subset to be open?
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What does a sideways u mean in math?

It is used in set theory and its meaning depends on the way that it is facing. If the open end is to the right then it indicates that the first set is a subset of the second. If the open end is to the left then it indicates that the first set is a superset of the second (the second is a subset of the first).


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Since ASCII ⊊ unicode, I don't know if there are ASCII codes for subset and proper subset. There are Unicode characters for subset and proper subset though: Subset: ⊂, ⊂, ⊂ Subset (or equal): ⊆, ⊆, ⊆ Proper subset: ⊊, ⊊,


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