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A combination of letters and numbers and symbols is a character set. To use a formula to combine letter and numbers and symbols is known as concatenation.
OUIJA
because of my nan
It makes clear that the following symbols should be read as numbers. Some Braille symbols do double duty as letters and numbers, and there are symbols that flag that the following should be read as numbers or as letters. en.m.wikipedia.org/wiki/English_Braille#Contractions
a combination of numbers and letters.
It is a "mark" or combination of letters, numbers, symbols or "slogan" that identifies a company or it's goods and services as being different from it's competitors.
Algebra makes use of letters and mathematical symbols.
Just use letters and numbers, no symbols.
It is an expression.
A chemical formula.
one that has a lot of random letters, numbers, and symbols
style