You find me on a die, and
The flag of a peaceful island
I'm used on maps, but not many
I'm an old coin, but not a penny

What am I?

I'm not a star, nor a letter/number.
If not solved, I'll provide a hint every 24 hours.

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    $\begingroup$ My first puzzle. Having been part of PSE for a few months, I'm expecting either a) a correct answer in minutes b) answers that address the question but weren't something I thought of c) A slap on the wrist for a too-broad question! $\endgroup$ – Phylyp Mar 11 '18 at 4:35
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    $\begingroup$ Congrats on your first question! $\endgroup$ – NL628 Mar 11 '18 at 5:16

You are referring to

a quincunx

It is a

Roman coin, and also the arrangement of 5 dots on the "5" side of a die. It's an arrangement of stars on the Solomon Islands flag, and also refers to a specific map projection.

To elaborate a little more on one bit of trivia,

the map projection is so-named because one pole is placed at the center of a square, and the other pole is mapped to all four corners of the square. The poles are therefore in the same relative positions as the five pips on a die.

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    $\begingroup$ Nicely done, that was quick! $\endgroup$ – Phylyp Mar 11 '18 at 5:13
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    $\begingroup$ Out of curiosity, which line was the key one for you? @eric-tressler $\endgroup$ – Phylyp Mar 11 '18 at 5:19
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    $\begingroup$ @phylyp probably the "old coin" because that one is hard to make a pun for $\endgroup$ – NL628 Mar 11 '18 at 5:50
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    $\begingroup$ I was familiar with the name of the arrangement on a die; I suspected that it had other meanings, and a search confirmed my guess. $\endgroup$ – Eric Tressler Mar 11 '18 at 6:34
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    $\begingroup$ Ah, your involvement in the MathOverflow and Mathematics explains that! $\endgroup$ – Phylyp Mar 11 '18 at 7:00

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