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Unique

generates a new symbol, whose name is of the form $nnn.

generates a new symbol, with a name of the form x$nnn.

Unique[{x,y,…}]

generates a list of new symbols.

Unique["xxx"]

generates a new symbol, with a name of the form xxxnnn.

Details

Unique[x] numbers the symbols it creates using $ModuleNumber, and increments $ModuleNumber every time it is called.
Unique["xxx"] numbers the symbols it creates sequentially, starting at 1 for each string xxx.
Unique[name,{attr₁,attr₂,…}] generates a symbol that has the attributes attr_i.

Examples

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Basic Examples (1)

Scope (3)

Create a unique symbol with no particular name:

Create a unique symbol whose name begins with x:

Create a unique symbol in the way Module does:

Properties & Relations (3)

Each use of Unique[symbol] increments $ModuleNumber:

Unique[symbol] creates symbols in the same way Module does:

Unique["x"] uses the first unused symbol of the form xnnn:

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