Summary of Exceptions

The list below contains a summary of all exception.

The use of 1d, 2d and 3d needs special mention.
The section Use abbreviations and acronyms with care states that two-letter acronyms must have both letters capitalized provided that each letter represents a different word. E.g. UI (“Use Interface”) and IO (“Input/Output”) but Db (because the word is Database and not Data Base). 1d is short for One Dimensional – which is two words and should really be abbreviated to OD or 1D.
The rule Names may not start with a number states that we cannot start with 1d, 2d and 3d. And lastly Use numbers with care states that we should try and avoid numbers entirely.
The rule When combining terms, arrange them in increasing order of significance suggest that 2dDrawing should be used rather than Drawing2d – but this would break the previous rule.
So when it comes to 1d, 2d, 3d; only use them after another term and always as lowercase ‘d’.
Never use the words OneDimensional, TwoDimensional or ThreeDimensional even if it appears to be more consistent.
Class names should use the singular form; except for relationships – where we want the relationship name to indicate the cardinality.

Last Updated: 21 November, 2022