The equals sign. It must appear at the start of all formulas.
The prefix of "sign" is "un-" and the suffix is "-ed."
Sign- is the prefix of signature. It means to mark or sign.
sign-ature...signature
Design.Ensign.
All formulas in Excel must begin with the equals sign, and that includes ones that just use functions. Without the equals sign, it will be treated as a piece of text.
The prefix for "sign" is "re-". For example, resign means to give up a position or job.
B2O3: Note that the prefix "di-" means two and the prefix "tri-" means three.
The equals sign goes at the beginning of a formula, as all formulas must begin with one. It is also possible to have the equals sign at other parts of a formula too.
The chemical formula for heptasulfur dioxide is S7O2.
THe chemical formula (not molecular sign) for propane is C3H8.
If you mean in Excel, yes: you must always start a formula with an equal sign.