There is a question about how to pluralize abbreviations, particularly acronyms. This has led to a proliferation of new abbreviations, acronyms and initialisms. Spelling errors are resolved by using Unicode alias names and abbreviations. Note that brackets clarify abbreviations and ellipsis marks omitted usage examples. Languages that use other alphabets have their own abbreviations and conventions. The International Plant Names Index maintains an approved list of botanical author abbreviations. Commonly used statistics with their abbreviations are explained here. Marks come in two varieties, abbreviations and abstract symbols. Compilers use many of these crossword abbreviations. These codes do not overlap with the 13 Canadian subnational postal abbreviations. Examples of common blood test abbreviations are shown below. The sources of the postal abbreviations vary. They are distinguished from common Morse abbreviations. American English makes no distinction between abbreviations that are contractions and abbreviations that are not. The Unicode character is used to mark Syriac abbreviations and numbers.