When a symbol is used for a number it could be any symbol at all. It could be a letter from the Roman or Greek alphabet, upper case or lower case. It could also be any random symbol that you like provided that it is not a "reserved" symbol. By that I mean you cannot use "+" as a symbol since that might be very confusing!
it is any letter or mathematical symbol that represent a number or a set of number
The greater than symbol is typically a mathematical symbol declaring that one given value or number is greater than another given value or number. One would use this symbol for certain mathematical applications, as well as to indicate in any circumstance that one things value is greater than another.
Q is the set of all rational numbers. The letter Q is used because rationals can be expressed as a quotient of two integers. Any letter from the Greek or Latin alphabet may be used as a symbol for an individual rational number.
variable
after
The cube symbol is the number 3 in a superscript format (Any number³)
it is any letter or mathematical symbol that represent a number or a set of number
1()
it is a variale
It can have any relation symbol - provided the relation is stated correctly.
9876543210
X
yes
The symbol for number is #
I will assume that you mean " to the power of two ". A symbol for any n-power is to put the number (n) on the side, above the number. Like this: nn.
No. Radical(1.21) = 1.1, for example, is rational.
Synthetic ElementsQuasi-synthetic elements:Technetium, atomic number 43Promethium, atomic number 61Astatine, atomic number 85Francium, atomic number 87Neptunium, atomic number 93Plutonium, atomic number 94Transuranium elementsAmericium symbol Am, atomic number 95Curium symbol Cm, atomic number 96Berkelium symbol Bk, atomic number 97Californium symbol Cf, atomic number 98Einsteinium symbol Es, atomic number 99Fermium symbol Fm, atomic number 100Mendelevium symbol Md, atomic number 101Nobelium symbol No, atomic number 102Lawrencium symbol Lr, atomic number 103Transactinide elements Rutherfordium symbol Rf, atomic number 104Dubnium symbol Db, atomic number 105Seaborgium symbol Sg, atomic number 106Bohrium symbol Bh, atomic number 107Hassium symbol Hs, atomic number 108Meitnerium symbol Mt, atomic number 109Darmstadtium symbol Ds, atomic number 110Roentgenium symbol Rg, atomic number 111Copernicium symbol Cn atomic number 112Provisional names of Recently observed synthetic elements:Ununtrium symbol Uut, atomic number 113Ununquadium symbol Uuq, atomic number 114Ununpentium symbol Uup, atomic number 115Ununhexium symbol Uuh, atomic number 116Ununseptium symbol Uus, atomic number 117.Ununoctium symbol Uuo, atomic number 118