Which type of code assigns numbers or letters in a consecutive order to documents like invoices or cheques?

When documents like invoices or cheques are numbered in a consecutive order (such as Invoice No. 001, 002, 003... or Cheque No. 100001, 100002, 100003...), this system is called Sequential Code (also known as Serial Code).

Understanding different code types:

Block Code divides numbers into blocks for different categories. For example, accounts 1000-1999 for assets, 2000-2999 for liabilities.

Mnemonic Code uses abbreviations or letters that are memorable and relate to the item, such as "CA" for Cash Account or "SAL" for Salaries.

Sequential Code assigns numbers or letters in consecutive order, where each new document receives the next number in the series. This ensures each document has a unique identifier and makes tracking easier.

Functional Code represents the function or purpose of items through number classifications.

Since the question specifically mentions "consecutive order" for invoices and cheques, the answer is Sequential Code.

The correct option is 3.