Built-in Mathematica Symbol

SetAttributes

SetAttributes[s, attr]
adds attr to the list of attributes of the symbol s.

SetAttributes[{s₁, s₂, ...}, attrs] sets attributes of several symbols at a time.

Add an attribute to the list of attributes of a symbol:

Add more attributes; the previous ones are retained:

Add several attributes:

Add the same attributes to several symbols:

Set a single attribute for the symbols f and g:

SetAttributes adds to the already existing attributes; Attributes[g]={..} resets the list:

SetAttributes is equivalent to this assignment to the attributes:

Use ClearAttributes to clear a particular attribute:

Protecting a symbol is equivalent to setting the Protected attribute:

You can still change the attributes of a protected symbol:

After setting the attribute Locked, no more changes to the attributes can be made:

A locked symbol can no longer be unprotected, as the Protected attribute cannot be cleared:

This sets attributes of the symbol syms itself:

This sets the attributes of all symbols in the list syms:

The 10 system symbols with the most attributes: