The letter "Ø" is sometimes used in mathematics as a replacement for the symbol "∅" (Unicode character U+2205), referring to the empty set as established by Bourbaki, and sometimes in linguistics as a replacement for same symbol used to represent a zero.
Regarding this, what is the upside down U symbol in math?
Union and Intersection. We just saw how to join two sets using "Union" (and the symbol ∪). There is also "Intersection" which means "has to be in both". Think "where do they overlap?". The Intersection symbol is an upside down "U" like this: ∩
What does the U stand for in math?
The Math Symbols from the Question about Union and Intersection. The “V” symbols in the reader's question are ∨ and ∧, which mean “Logical Or” and “Logical And.” The ∧ is a capital Greek Lambda. The symbol for “Union of sets” is '∪', while the symbol for “intersection of sets” is '∩.'
Is Union and or or?
The symbol for Union is and the symbol for Intersection is . Observe the following example and note that the union of sets is the set of elements that is in the first set “or” the second set while the intersection of sets is the set of elements that are in the first set “and” the second set.