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The phrase "alphanumeric character" is correct and usable in written English.
It is typically used in contexts related to computing, programming, or data entry to refer to characters that are either letters or numbers.
Example: "Please ensure that your password contains at least one alphanumeric character to enhance security."
Alternatives: "letter or number" or "alpha-numeric symbol".
Exact(10)
It's an alphanumeric character, #.
Other hackers use "rainbow tables," which list hash values for nearly every alphanumeric character combination, up to a certain length.
Others will use "rainbow tables," which list encrypted values for nearly every alphanumeric character combination up to a certain length.
The VIN is a 17-digit alphanumeric character vector code, which does not include the letters I, O, Q, or Z to avoid confusion with digits.
While hashes make hackers' break-ins more difficult, hashed passwords can easily be cracked using so-called rainbow tables — readily available databases of hash values for nearly every alphanumeric character combination, up to a certain length.
USSD has a 182 alphanumeric character limit, making it ideal for short messages on mobile devices.
Similar(50)
This identifier is restricted to alphanumeric characters.
(For comparison, this article contains 2,006 alphanumeric characters).
A Version 40 QR Code can contain 7,089 numeric characters or 4,296 alphanumeric characters.
Font, assortment or set of type (alphanumeric characters used for printing), all of one coherent style.
Secondly, instances should be short and limited to alphanumeric characters, underscores, hyphens and periods.
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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