| Keyword | Definition |
|---|---|
| base | the number of different symbols available to use in each place in a sequence |
| base 10 | a representation that has 10 different symbols (e.g. writing numbers in decimal with the numbers 0 - 9) |
| base 16 | a representation that has 16 different symbols (e.g. describing colours in hexadecimal with 0-9 and A-F) |
| base 2 | a representation that has two different symbols (e.g. binary with 0 and 1) |
| base 26 | a representation that has 26 different symbols (e.g. writing messages using the letters A-Z) |
| base 64 | a representation that has 64 different symbols (e.g. describing the contents of files using A-Z, a-z, 0-9 and some additional punctuation symbols) |
| message length | the number of symbols needed in a sequence to represent a message |
