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From NALPs: a novel protein family involved in inflammation.

FIIND - Domain with Function to Find.

What is the meaning of this name? Does it mean "Domain with an unknown function"?

I'm translating an article in which this domain is mentioned, and I found three different translations of the term into Russian: "Domain with an unknown function", "Domain with a search function", "Domain with identification function".

I think the first translation is the most logical one, but I'm asking just in case, because I'm not an expert in this field.

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    $\begingroup$ In my opinion it is broken English, presumably contorted in this way to provide an acronym. To find out what the culprits intend it to mean you would need to read the paper. Dictionaries will not help. $\endgroup$ – David May 7 at 12:59
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I was pretty certain @David's comment was spot on, that this was some one-use funny acronym from just this paper, but a search of Google Scholar suggests that it has indeed been propagated sufficiently to have meaning beyond this paper, while also originating, as these things do, in some clumsy one-off usage.

One of them gives a clear definition that is consistent with what you supposed:

The acronym FIIND (domain with function to find) was coined several years ago to indicate a highly conserved protein region with unknown function[4]

D'Osualdo, A., Weichenberger, C. X., Wagner, R. N., Godzik, A., Wooley, J., & Reed, J. C. (2011). CARD8 and NLRP1 undergo autoproteolytic processing through a ZU5-like domain. PloS one, 6(11).

The paper they cite (reference 4 in the previous quote) is in fact this one:

Tschopp, J., Martinon, F., & Burns, K. (2003). NALPs: a novel protein family involved in inflammation. Nature reviews Molecular cell biology, 4(2), 95-104.

...which probably looks familiar since it is in fact the paper you started from. Importantly, though, this is not a generic term for a domain with unknown function, it's a specific domain which was known to be highly conserved (and since found in several other proteins) - it's just that it's specific function was at the time unknown.

This paper is a recent review of NLRP1 that may also be useful and has some discussions of what has been found of the functions of the FIIND:

Mitchell, P. S., Sandstrom, A., & Vance, R. E. (2019). The NLRP1 inflammasome: new mechanistic insights and unresolved mysteries. Current opinion in immunology, 60, 37-45.

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