a code (a series of characters or digits) that must be entered in some way (typed or dialed or spoken) to get the use of something (a telephone line or a computer or a local area network etc.) | a coding system used for transmitting messages requiring brevity or secrecy |
| a set of rules or principles or laws (especially written ones) |
| (computer science) the symbolic arrangement of data or instructions in a computer program or the set of such instructions |
| a series of letters, numbers or symbols assigned to something for the purpose of classification or identification |