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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
that is called
Grammar usage guide and real-world examplesUSAGE SUMMARY
"that is called" is a grammatically correct part of a sentence in written English.
You can use it when you want to indicate that something has a specific name or title. For example: "The red object in the corner of the room is a fire extinguisher, that is called a Superenator 4000."
✓ Grammatically correct
News & Media
Academia
Wiki
Alternative expressions(20)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
57 human-written examples
You know what eating that is called?
News & Media
This is the initial method that is called.
Academia
The member function of the Observer that is called.
Academia
semicolon n. the standard character that is called ''semicolon".
ampersand n. the standard character that is called ''ampersand".
tilde n. the standard character that is called ''tilde".
This gives a total that is called eleven in denary.
In Wall Street parlance, that is called leverage.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
3 human-written examples
Troopergate, that was called.
News & Media
Justice Scalia, that's called democracy.
News & Media
Devices like that are called "universal computers".
News & Media
Expert writing Tips
Best practice
Use "that is called" when introducing a term or concept, ensuring clarity and proper identification for your audience. For example: "The process of plants converting light into energy, that is called photosynthesis, is vital for our ecosystem."
Common error
Avoid using "that is called" when the term being introduced is already well-known or easily understood from the context. Instead, use more concise phrasing. Example: Instead of saying 'The liquid we drink every day, that is called water, is essential', simply state 'Water is essential'.
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "that is called" serves as a defining relative clause, functioning to introduce and name a specific concept, object, or phenomenon. This is evident from Ludwig examples where it's used to provide a name for something already described.
Frequent in
News & Media
58%
Academia
27%
Wiki
10%
Less common in
Formal & Business
2%
Science
2%
Reference
1%
Ludwig's WRAP-UP
In summary, the phrase "that is called" is a versatile tool for introducing and defining terms across diverse contexts. As Ludwig AI suggests, it's a grammatically correct phrase, and its frequent appearance in news, academic texts, and wikis underscores its widespread utility. The phrase serves primarily to clarify concepts by providing specific terminology. While the register is generally neutral, alternatives like "which is known as" or "this is termed" can modulate the formality. To ensure effective communication, it's best to avoid using "that is called" when the term is already clear or widely known. The most authoritative sources using this phrase are The New York Times and The Guardian.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
which is known as
Replaces "that is called" with a more formal tone.
otherwise known as
Offers an alternative identification, often for clarification.
this is termed
Uses a more technical or formal vocabulary.
it's referred to as
Emphasizes the act of referring to something by a specific name.
that's denoted as
Indicates a specific symbol or notation is used.
it goes by the name of
A more descriptive and less formal way of introducing a name.
we refer to this as
Highlights the speaker's or group's specific terminology.
this process is named
Emphasizes a specific naming event.
it is designated
Suggests an official or formal assignment of a name.
in other words
Introduces a simpler term or explanation.
FAQs
How can I use "that is called" in a sentence?
Use "that is called" to introduce a specific term or name for something. For example: "The fear of spiders, "that is called" arachnophobia, is quite common."
What phrases are similar to "that is called"?
Similar phrases include "which is known as", "otherwise known as", and "it's referred to as", all used to introduce or clarify a term.
Is there a more formal alternative to "that is called"?
Yes, a more formal alternative is "this is termed", which is often used in academic or technical writing.
What's the difference between "that is called" and "such is called"?
"That is called" is more common in everyday language. "Such is called" has an archaic feel, although it's still used.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested