رمز التحقق في رسالة من مرسل مجهول.

This is an iḍāfa construction, often called the construct phrase.

• رمز = code
• التحقق = the verification

Together, رمز التحقق literally means code of the verification, which is the natural Arabic way to say verification code.

Arabic often uses this noun + noun pattern where English might use:

• a noun + of
• or an adjective-like noun combination

So رمز التحقق is not two separate ideas; it is one unit.

In Arabic, the verb to be is usually not written in the present tense.

So a sentence like:

• رمز التحقق في رسالة...

can naturally mean:

• The verification code is in a message...

This is very normal in Arabic. The present-tense is/am/are is understood from context.

That is another feature of the iḍāfa structure.

In an iḍāfa:

• the first noun usually does not take الـ
• the second noun can be definite or indefinite
• the definiteness of the whole phrase depends on the second noun

So:

• رمز التحقق = the verification code
• literally: code of the verification

Because التحقق is definite, the whole phrase becomes definite.

في is a preposition meaning in.

So:

• في رسالة = in a message

It introduces the location or context where the verification code appears.

Word by word:

• من = from
• مرسل = sender
• مجهول = unknown

So:

• من مرسل مجهول = from an unknown sender

This is a prepositional phrase describing the message.

Because in Arabic, adjectives normally come after the noun they describe.

So:

• مرسل مجهول = an unknown sender

This is the normal noun + adjective order in Arabic.

English says:

• unknown sender

Arabic says:

• sender unknown

It describes مرسل, not رسالة.

Why?

Because it comes directly after مرسل and matches it as its adjective.

So:

• مرسل مجهول = unknown sender

If Arabic wanted to say an unknown message, it would be:

• رسالة مجهولة

Notice the feminine ending on مجهولة to match رسالة, which is feminine.

Because مجهول is describing مرسل, and مرسل is a masculine singular noun.

Arabic adjectives must agree with the noun they describe in things like:

• gender
• number
• definiteness

So:

• مرسل مجهول = masculine singular + masculine singular

If the adjective were describing رسالة, then it would be feminine:

• رسالة مجهولة

It can work as a short nominal sentence, but it also feels very natural as a label, alert, or notification-style phrase.

In modern interfaces and short informational text, Arabic often uses concise wording like this without making everything fully explicit.

So depending on context, it may feel like:

• The verification code is in a message from an unknown sender.
• or simply
• Verification code in a message from an unknown sender.

Both are consistent with this kind of compact Arabic style.

A fully vocalized version would be:

رَمْزُ التَّحَقُّقِ في رِسالَةٍ مِن مُرْسِلٍ مَجْهولٍ

A rough pronunciation is:

ramzu t-taḥaqquqi fī risālatin min mursilin majhūlin

A few notes:

• رمزُ is nominative here
• التحققِ is genitive because it is the second part of an iḍāfa
• رسالةٍ is genitive after في
• مرسلٍ is genitive after من
• مجهولٍ matches مرسلٍ

In everyday writing, these short vowel endings are usually omitted.

Yes. In technical contexts, التحقق can mean things like:

• verification
• checking
• sometimes authentication, depending on context

So رمز التحقق is often used for:

• verification code
• confirmation code
• sometimes a code used in authentication

The exact English choice depends on the situation, but verification code is the most straightforward match here.