it indicate where and what to drop in
The plus symbol, "+", is used to indicate an addition.
Which symbol is used with a variable to indicate to the script that you are reading the contents of that variable?
It is the RADICAL SIGN , its definition is - the symbol used to indicate a nonnegitive square root.
The symbol "->" (arrow) is used in a chemical equation to indicate produces or yields.
The symbol used in music to indicate a repeat of a section is called a "repeat sign."
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The arrow symbol "→" is used in a chemical equation to indicate the direction in which the reactants are transforming into products.
A plus (+) is used to indicate an add-on.