Which type of code assigns numbers or letters in a consecutive order…

NCERT (2026-27 edition):
Sequential Codes – “In Sequential Code, numbers and/or letters are assigned in consecutive order. These codes are applied primarily to source documents such as cheques, invoices, etc. A sequential code can facilitate document searches. This process enables in either identification of missing codes (numbers) relating to a particular document or a relevant document can be traced on the basis of code.”