Ορίστε η τράπουλα και τα πιόνια.

Here Ορίστε is a presentational word meaning something like here you are, here is, or here are.

In this sentence, it introduces the things being shown or handed over:

• η τράπουλα = the deck
• τα πιόνια = the pawns / playing pieces

So Ορίστε is doing the job of presenting them to the listener.

No. Ορίστε stays the same.

So you can use it with:

• one thing: Ορίστε η τράπουλα.
• more than one thing: Ορίστε η τράπουλα και τα πιόνια.

Unlike English here is / here are, Greek does not change ορίστε for number.

Because Greek articles must agree with the noun in gender and number.

Here:

• η τράπουλα = feminine singular
• τα πιόνια = neuter plural

So the articles match each noun:

• η = feminine singular the
• τα = neuter plural the

Because this sentence is using ορίστε in a presentational way: here is/are ...

That normally takes the noun in the nominative:

• η τράπουλα = nominative
• τα πιόνια = nominative

If you were using ορίστε more like here, take ..., Greek often uses the accusative instead:

• Ορίστε την τράπουλα. = Here’s the deck / Here, take the deck.

So η τράπουλα is not a mistake; it shows the sentence is presenting the items rather than just handing them over as direct objects.

Not exactly. Greek does not need to say είναι here.

English might say:

• Here are the deck and the pawns.

Greek simply uses:

• Ορίστε η τράπουλα και τα πιόνια.

So there is no separate verb to be in the sentence. Ορίστε itself handles the presenting idea.

Η τράπουλα means deck of cards or pack of cards.

It is a feminine noun, so you learn it as:

• η τράπουλα

Τα πιόνια is the plural of το πιόνι.

So:

• singular: το πιόνι
• plural: τα πιόνια

Depending on context, πιόνι can mean:

• a pawn in chess
• a playing piece in a board game
• sometimes figuratively, a pawn in the sense of someone being used by others

In this sentence, it most naturally means the game pieces.

Yes. In this sentence, each noun has its own definite article:

• η τράπουλα
• τα πιόνια

That is the normal Greek pattern. Since the two nouns have different gender/number, their articles are also different, so both must be shown.

Because Modern Greek spelling keeps older historical spellings, but several letters now have the same sound.

So η is written with the letter eta, but in Modern Greek it is pronounced /i/, like:

• η = ee

That is why η τράπουλα is pronounced roughly ee TRA-poo-la.

A rough English-style pronunciation is:

o-REE-steh ee TRA-poo-la ke ta pee-O-nya

A few notes:

• Ορίστε → stress on ρί
• τράπουλα → stress on τρά
• πιόνια → stress on ό
• και is often pronounced very lightly, close to ke

No. Ορίστε is a very common word with several uses, including:

• here you are / here is / here are
• go ahead
• yes?
• pardon? / sorry? when asking someone to repeat something

So its exact meaning depends on context. In this sentence, it is clearly the here is/are kind.