Numărul de urmărire este pe eticheta ambalajului.

Because -ul is the definite article attached to the end of a masculine/neuter noun in Romanian.

• număr = a number
• numărul = the number

So numărul de urmărire means the tracking number.

This is very different from English, where the is a separate word. In Romanian, the definite article is usually attached to the noun itself.

de urmărire literally means something like for tracking or of tracking.

• urmărire is a noun meaning tracking, following, or monitoring
• de often links nouns in Romanian, similar to of or sometimes for in English

So:

• număr de urmărire = tracking number
• literally: number of tracking

This structure is very common in Romanian:

• sală de clasă = classroom
• perie de dinți = toothbrush
• număr de telefon = telephone number

It comes from the verb a urmări, which means to follow, to track, or to monitor.

So the pattern is:

• a urmări = to track
• urmărire = tracking

Romanian often forms nouns from verbs this way. So if you know the verb, it can help you understand the noun.

Yes, in this sentence you do.

• este = is

Romanian usually requires the verb a fi (to be) in sentences like this:

• Numărul de urmărire este pe eticheta ambalajului.
• The tracking number is on the package label.

Unlike in some languages, you normally do not leave out is in this kind of sentence.

Because pe means on, while în means in.

Here the number is written on the label, not inside it.

• pe etichetă / pe eticheta... = on the label
• în etichetă would sound wrong here

Romanian uses pe for surface contact, just like English on:

• pe masă = on the table
• pe perete = on the wall
• pe etichetă = on the label

Because eticheta means the label.

• etichetă = a label
• eticheta = the label

This is the feminine singular definite form. Romanian attaches the article to the noun:

• etichetă → eticheta

So pe eticheta ambalajului means on the label of the package.

ambalajului is the genitive/dative definite singular form of ambalaj.

Base form:

• ambalaj = package / packaging

In this sentence:

• ambalajului = of the package

So:

• eticheta ambalajului = the label of the package

This is how Romanian often shows possession or of relationships:

• ușa casei = the door of the house
• culoarea mașinii = the color of the car
• eticheta ambalajului = the label of the package

Because Romanian often expresses of relationships through the genitive case, not with a separate word.

In English:

• the label of the package

In Romanian:

• eticheta ambalajului

So instead of adding a separate word like of, Romanian changes the form of the second noun:

• ambalaj → ambalajului

This is a very important pattern to get used to.

The word order is:

• Numărul de urmărire = subject
• este = verb
• pe eticheta ambalajului = prepositional phrase

So it follows a very familiar English-like pattern:

• Subject + verb + location

Literally:

• The tracking number is on the package label.

This makes the sentence fairly straightforward for English speakers.

Yes, Romanian word order is somewhat flexible, but the original version is the most neutral and natural.

For example, you could also say:

• Pe eticheta ambalajului este numărul de urmărire.

This puts more focus on where the number is.

But the original:

• Numărul de urmărire este pe eticheta ambalajului.

is the best default version for a learner.

The noun număr is neuter in Romanian.

Romanian neuter nouns behave:

• like masculine in the singular
• like feminine in the plural

In this sentence, it is singular, so it uses forms that look masculine:

• numărul = the number

For this sentence, the most important thing is simply to recognize numărul as the definite singular form.

Two important Romanian vowels appear here:

• ă in numărul
• â in urmărire

A rough guide:

• ă is a short, neutral vowel, similar to the a in English sofa
• â is a central vowel with no exact English equivalent; it sounds deeper and more closed than ă

Very rough pronunciation help:

• numărul ≈ NOO-muh-rul
• urmărire ≈ oor-muh-REE-reh

Also:

• ț and ș are common Romanian letters, though they do not appear in this sentence
• stress in urmărire falls on ri: ur-mă-RI-re

Yes. Both can be used, depending on context.

• număr de urmărire = tracking number
• cod de urmărire = tracking code

In many real-life situations, both are understandable. Sometimes cod may sound slightly more modern or technical, especially if the tracking reference contains letters as well as numbers.

But număr de urmărire is completely correct and common.

Because Romanian usually marks definiteness on the main noun, not on every word in the phrase.

So:

• numărul de urmărire = the tracking number

Here, numărul is definite, and that makes the whole noun phrase definite. You do not need to make urmărire definite too.

This is similar to English:

• we say the tracking number
• not the tracking the number

Romanian works differently in form, but the idea is similar: only the main noun gets the definite marking here.