Check Mark / Square Root Symbol
About Check Mark / Square Root Symbol
√ is the most common check mark / tick symbol, widely used to indicate "correct," "passed," "completed," and similar meanings. When searching for how to type a check mark, the answer is right here.
The √ symbol is ubiquitous in daily life: correct marks on test papers, completed items in to-do lists, approval marks in documents — none of them can do without it. In mathematics, √ is also the square root symbol, indicating the square root operation.
【Historical Origin】 The origin of the check mark symbol can be traced back to handwritten annotation habits, where a smooth stroke of a tick indicates approval. In the digital age, it was officially incorporated into the Unicode character set, becoming one of the standard symbols.
【Modern Applications】 √ is frequently used in UI confirmation buttons, form validation success prompts, task completion status in management software, and various scenarios requiring the indication of "correct" or "passed."
How to Type Check Mark / Square Root Symbol
Windows Input
Hold Alt, type 8730 on the numpad; or type duihao or gou in the input method and select √
Mac Input
Control + Command + Space, search "square root" or "check mark"; or type duihao in the input method
HTML/CSS Input
HTML: √ or √; CSS: content: "\221A";
LaTeX Input
Use \surd or \sqrt{} in math mode
Check Mark / Square Root Symbol FAQ
Are the check mark symbol √ and the square root symbol the same?
Yes, they are the same character U+221A. In mathematics, it is used as the square root symbol; in other contexts, it is used as a check mark. If you need a check mark without mathematical meaning, you can also use ✓ (U+2713) or ✔ (U+2714).
What are the check mark and cross mark in Unicode?
Common check marks: √ (U+221A), ✓ (U+2713), ✔ (U+2714); common cross marks: × (U+00D7), ✗ (U+2717), ✘ (U+2718).
How to quickly insert a check mark symbol in Word?
Type 221A, then press Alt + X to convert it to √. You can also select it from "Insert" → "Symbol." For checkboxes, use the R key with Wingdings font.
How to create a check box effect in Excel?
Use the checkbox control in the Developer tab; or type a check mark symbol using the input method. Simple alternative: enter √ in a cell with conditional formatting to achieve a dynamic check effect.
How to type a check mark symbol on a mobile phone?
Switch to the math symbols section of the symbol keyboard; on iOS, type duihao or gou in the Chinese input method for auto-suggestion; you can also directly copy and paste √.