Template:Nk

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Use

This template prefixes text with an invisible sort key based upon a real number for use in sortable tables with mixed numbers and text or just text. This template maintains a valid sort order with an accuracy of one part in 10,000,000,000 in the ranges 1e-300 to 1e300 and -1e-300 to -1e300.

The syntax of this template is:

{{nk|var1|var2}}

where:

• var1 = any real number (may contain thousands separators), ∞, 1/∞, -1/∞, -∞, INF, 1/INF, -1/INF, -INF, IND, indeterminate, UND, undefined, UNK, unknown, NA, not applicable, or not available.
• var2 = optional text to display (default = var1)
  • NOTE: If var2 is $, £, €, #, or No., var2 is prefixed to var1

The use of this template is illustrated in the sortable table below:

Wikitext	Invisible sort key prefix	sort without key	sort with key
{{nk|0|zero}}	<span style="display:none">!F </span>	zero	!F zero
{{nk|1|one}}	<span style="display:none">!C </span>	one	!C one
{{nk|+2}}	<span style="display:none">!B9993068528194 </span>	+2	!B9993068528194 +2
{{nk|-3}}	<span style="display:none">!J0010986122886 </span>	-3	!J0010986122886 -3
{{nk|-4.01267}}	<span style="display:none">!J0013894568551 </span>	-4.01267	!J0013894568551 -4.01267
{{nk|5.125}}&nbsp;amperes	<span style="display:none">!B9983658694749 </span>	5.125 amperes	!B9983658694749 5.125 amperes
{{nk|{{#expr:2*pi}}|2&pi;}}	<span style="display:none">!B9981621229335 </span>	2π	!B9981621229335 2π
{{nk|7|VII}}	<span style="display:none">!B9980540898509 </span>	VII	!B9980540898509 VII
{{nk|8.27|£}}	<span style="display:none">!B9978873654909 </span>	£8.27	!B9978873654909 £8.27
{{nk|-9.000}}	<span style="display:none">!J0021972245773 </span>	-9.000	!J0021972245773 -9.000
{{nk|10}} apples	<span style="display:none">!B9976974149070 </span>	10 apples	!B9976974149070 10 apples
{{nk|1776|MDCCLXXVI}}	<span style="display:none">!B9925178810764 </span>	MDCCLXXVI	!B9925178810764 MDCCLXXVI
{{nk|10,000,000,000}}	<span style="display:none">!B9769741490700 </span>	10,000,000,000	!B9769741490700 10,000,000,000
{{nk|10,000,000,001}}	<span style="display:none">!B9769741490699 </span>	10,000,000,001	!B9769741490699 10,000,000,001
{{nk|12,046,360,889,000|$}}	<span style="display:none">!B9698802162706 </span>	$12,046,360,889,000	!B9698802162706 $12,046,360,889,000
{{nk|1e100|googol}}	<span style="display:none">!B7697414907005 </span>	googol	!B7697414907005 googol
{{nk|-1|minus one}}	<span style="display:none">!I </span>	minus one	!I minus one
{{nk|0.25|$}}	<span style="display:none">!D0013862943611 </span>	$0.25	!D0013862943611 $0.25
{{nk|-0.035}}	<span style="display:none">!H9966475927825 </span>	-0.035	!H9966475927825 -0.035
{{nk|-1.4525e-9}}&nbsp;m	<span style="display:none">!H9796500203727 </span>	-1.4525e-9 m	!H9796500203727 -1.4525e-9 m
{{nk|1e-300|googol<sup>-3</sup>}}	<span style="display:none">!D6907755278982 </span>	googol-3	!D6907755278982 googol-3
{{nk|-1e300|-googol<sup>3</sup>}}	<span style="display:none">!J6907755278982 </span>	-googol3	!J6907755278982 -googol3
{{nk|1e-301}}	<span style="display:none">!E </span>	1e-301	!D6930781129912 1e-301
{{nk|-1e302}}	<span style="display:none">!K </span>	-1e302	!K -1e302
{{nk|-1e-303}}	<span style="display:none">!G </span>	-1e-303	!H3023167168228 -1e-303
{{nk|INF|1/0}}	<span style="display:none">!A </span>	1/0	!A 1/0
{{nk|IND|0/0}}	<span style="display:none">!L </span>	0/0	!L 0/0
{{nk|UND|∞ - ∞}}	<span style="display:none">!M </span>	∞ - ∞	!M ∞ - ∞
{{nk|UNK|x}}	<span style="display:none">!N </span>	x	!N x
{{nk|NA}}	<span style="display:none">!O </span>	NA	!O NA
{{nk|not a number|AAA}}		AAA	AAA
{{nk||ZZZ}}		ZZZ	ZZZ

See also

This template invokes Template:Numkey2 to create the invisible sort key prefix.