backslash
MediumTechnical/Computing
Definition
Meaning
A punctuation mark ( \) used in computing to separate directories in file paths and as an escape character in many programming languages.
The symbol ( \) used to denote division in some mathematical contexts, or to indicate an alternative in certain writing conventions (e.g., and/or).
Linguistics
Semantic Notes
Primarily a technical term. In everyday usage, it is often simply called 'the slash that goes backwards' or 'reverse slash' by non-technical users.
Dialectal Variation
British vs American Usage
Differences
No significant semantic difference. Pronunciation differences exist (see IPA).
Connotations
None.
Frequency
Equal frequency in technical contexts in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
The path requires a backslash.You must escape the backslash.The backslash precedes the escape sequence.Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Rare, except in IT documentation (e.g., 'Enter the server path using backslashes').
Academic
Used in computer science, linguistics (phonemic notation), and mathematics.
Everyday
Very low frequency. Mostly encountered when giving computer instructions.
Technical
High frequency. Core term in programming, file systems, and regular expressions.
Examples
By Part of Speech
adjective
British English
- The backslash key is worn out on my keyboard.
- We need to fix the backslash character encoding.
American English
- Press the backslash key to continue.
- There's a backslash escape sequence in line 42.
Examples
By CEFR Level
- Look at the keyboard. Can you find the backslash key?
- The computer teacher wrote a backslash on the board.
- In the file address, use a backslash between the folder names.
- I think you typed a forward slash instead of a backslash.
- To escape special characters in the code, you often need to precede them with a backslash.
- The API documentation specifies that the directory separator must be a backslash.
- The regular expression employs a backslash as a metacharacter to denote a word boundary.
- Due to the escaping mechanism, consecutive backslashes in the raw string literal are interpreted differently.
Learning
Memory Aids
Mnemonic
Imagine the backslash ( \) is leaning BACKwards, unlike the forward slash (/) which leans forward.
Conceptual Metaphor
A DIVIDER or SEPARATOR (for paths), a SIGNAL or ESCAPE (in code).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'косая черта' (slash, /). The Russian term is 'обратная косая черта' or 'бэкслэш'.
- In Russian typography, the backslash symbol is rarely used outside computing contexts.
Common Mistakes
- Using a forward slash (/) where a backslash (\) is required in Windows file paths.
- Pronouncing it as 'backflash'.
- Forgetting to escape the backslash in string literals (e.g., writing 'C:\Users' instead of 'C:\\Users').
Practice
Quiz
In which context is a backslash most commonly used?
FAQ
Frequently Asked Questions
A backslash (\) leans backwards and is primarily used in computing (Windows file paths, escape characters). A forward slash (/) leans forward and is used in URLs, fractions, dates, and as 'or'.
On most keyboards, the backslash key is located above the 'Enter' or 'Return' key, often sharing a key with the vertical bar '|'. You may need to press 'Shift'.
A single backslash is often an 'escape character' that changes the meaning of the next character. To represent an actual backslash character itself, you need to 'escape the escape character', hence the double backslash (\\).
Less frequently. Their file systems primarily use forward slashes (/) as path separators. Backslashes are still used for their escape character function in shells and programming languages.