The term "onigiri" covers all kinds of rice balls, with or without filling,
and with or without nori seaweed around it.

Is there a specific term that only covers the one class of onigiri available
in supermarkets and konbinis that is triangular in shape, has a filling, and
is wrapped in a special way that keeps the nori separate from the rice until
it is opened so that it stays crisp?

![specially wrapped triangular onigiri](https://i.stack.imgur.com/as6id.jpg)

(Side note: In Korean I don't know of a generic term for onigiri but there is
a term for this specific kind: "삼각김밥" [samgak gimbap].)
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words food
Is there a word for the type of onigiri that comes in the triangular wrap that keeps the nori fresh?
Not really. The closest is "三角のおにぎり" to describe the shape. Onigiri have been
made in many different shapes over time, including a round shape and the
occasionally clever shape that a creative mom might try to make. But many
people now think of triangular ones as the normal mode, so you wouldn't need
to say anything other than "onigiri" to imply the triangular shape. You might
need to use special terms now to imply non-triangular shapes, the same way you
might describe a "square hamburger bun" in English.

I'm not entirely sure if it's the shape or the packaging that you're concerned
with identifying. However, unless you're a packaging industry professional,
there's probably no need to make that distinction, and therefore there's no
commonly used term to describe that special packaging. The fact that you got
it at a convenience store or supermarket will be enough to imply this kind of
packaging, so you could just say "コンビニのおにぎり" if you got the product at a
convenience store.

In Korean the term you are describing, kimbap, without the "samgak" modifier,
usually implies a rolled sushi-like item which resembles makimono (巻物) in
Japanese. This may explain the need to use the "triangular" modifier in
Korean.

As a food geek, I can attest to the credibility of the onigiri explication
here: <http://justbento.com/handbook/bento-basics/onigiri-on-parade-guide-
onigiri-omusubi-rice-ball-shapes-types-and-fun>
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I always had the feeling that [お]むすび ([o]musubi) was more closely associated
with onigiri of triangular shape.

The Japanese Wikipedia entry on onigiri seems to agree. Although they point
out that both words are generally interchangeable and depend on
regions/households, they list the following as one of the difference between
the two terms:

```

    1. おにぎりは形を問わないが、おむすびは三角形という説。
    
```

("theory 1: onigiri doesn't have to do with a specific shape, omusubi is
triangular.")

... But then go on to say that other people see the exact opposite:

```

    2. おにぎりが三角型で、おむすびは俵型という説
    
```

Bottom line: there is definitely a connection between shape and use of
おにぎり/むすび, but it depends who you ask...
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I do not know a specific term referring to onigiri with a plastic film
separating nori from rice.

[Wikipedia](http://ja.wikipedia.org/wiki/%E3%81%8A%E3%81%AB%E3%81%8E%E3%82%8A#.E7.8F.BE.E5.9C.A8.E3.81.AE.E3.81.8A.E3.81.AB.E3.81.8E.E3.82.8A)
calls this plastic film “おにぎりフィルム,” but I did not know this name and do not
expect that many people know the name.

If I want to refer to this kind of onigiri, I would say something explanatory
such as “海苔がフィルムでご飯から仕切られているタイプのおにぎり” (のりがフィルムでごはんからしきられているタイプのおにぎり; onigiri
of the kind where nori is separated from rice by a film).

From your comment on the question:

> For instance if a friend is going to the konbini and offers to pick
> something up for me, how would I say "Yes get me some onigiri please, but
> not the kind with the clammy nori"?

In this case, I might just say “海苔が湿気てないのがいい” (のりがしけてないのがいい; It will be better
if the nori is not clammy).
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コンビニおにぎり... or nothing.

2chan, where you'd expect slang:
<http://logsoku.com/thread/tsushima.2ch.net/news/1278418851/>

otaku, where you'd expect precision: <http://blog.livedoor.jp/cvs_onigiri/>

That's a general term for any onigiri at convenience stores. The 2chan thread
makes it obvious that a supermarket onigiri is different (and better!).

The otaku site uses a "type" field to include things like triangular vs.
square. No differentiation is made between "tear here" bagged onigiri and the
ones with separated, folding nori.
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