Del

1. The symbol ∇ used to denote the gradient operator.
2. The symbol ∂, in the context of a partial differential

noun

A part, portion

1. A person authorized to act as representative for another; a deputy
2. A representative at a conference, etc.
3. An appointed representative in some legislative bodies
4. A type of variable storing a reference to a method with a particular signature, analogous to a function pointer

1. An act of delegating.
2. A group of delegates used to discuss issues with an opponent.
3. A method-dispatching technique describing the lookup and inheritance rules for self-referential calls.
4. A contract whereby the original debtor substitutes a new debtor in his stead, with the creditor’s permission.

verb

To remove, get rid of or erase, especially written or printed material, or data on a computer or other device.