Property talk:P416

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quantity symbol (string)
symbol for a mathematical or physical quantity

Description	Symbol of a quantity - quantity symbol (Q1401551)
Represents	quantity symbol (Q1401551)
Data type	String
Template parameter	"Formelzeichen" from de:Vorlage:Infobox Physikalische Größe ;see Template:Infobox physical quantity (Q8761512).
Domain	According to this template: physical and mathematical quantities - magnitude (Q2091629) According to statements in the property: individual quantity (Q71550118) When possible, data should only be stored as statements
Allowed values	According to this template: 1 Unicode symbol (or sequence of symbols ??) According to statements in the property: [^\s\/]{1,6} When possible, data should only be stored as statements
Example	electric charge (Q1111) → Q q temperature (Q11466) → T
Source	ISO/IEC 80000 (note: this information should be moved to a property statement; use property source website for the property (P1896))
Tracking: usage	Category:Pages using Wikidata property P416 (Q107183340)
See also	unit symbol (P5061), quantity symbol (LaTeX) (P7973)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Database reports/Constraint violations/P416 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 309 Main statement 94 30.4% of uses Qualifier 215 69.6% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Type “individual quantity (Q71550118)”: item must contain property “instance of (P31), subclass of (P279)” with classes “individual quantity (Q71550118)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P416#Type Q71550118, SPARQL

Format “[^\s/]{1,6}”: value must be formatted using this pattern (PCRE syntax). (Help)

List of violations of this constraint: Database reports/Constraint violations/P416#Format, hourly updated report, SPARQL

Conflicts with “instance of (P31): unit of measurement (Q47574)”: this property must not be used with the listed properties and values. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P416#Conflicts with P31, search, SPARQL

Conflicts with “unit symbol (P5061)”: this property must not be used with the listed properties and values. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P416#Conflicts with P5061, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P416#Entity types

Scope is as qualifier (Q54828449), as main value (Q54828448): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P416#Scope, SPARQL

This property is being used by: ca:Plantilla:Infotaula de magnitud física ru:Шаблон:Физическая величина pcd:Modèle:Début Infoboéte V2 sv:Mall:Faktamall enhet ce:Кеп:Физикан йоккхалла, ce:Кеп:Физикин бустам eu:Txantiloi:Magnitude infotaula az:Şablon:Fiziki kəmiyyət uz:Andoza:Fizik miqdor tyv:Майык:Физиктиг хемчег be-tarask:Шаблён:Фізычная велічыня Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)

Can we get this property to support subscripts?

Swpb (talk) 15:42, 6 March 2019 (UTC)

• Maybe you could try a distinct string property with HTML format or a TeX one. --- Jura 13:50, 10 March 2019 (UTC)
• I would like that, too. Toni 001 (talk) 02:18, 6 November 2019 (UTC)

@Swpb, Jura1: I proposed a replacement property with "math" datatype: Wikidata:Property proposal/quantity symbol Toni 001 (talk) 21:55, 26 November 2019 (UTC)

• I'm not really sure where Wikidata:Property proposal/quantity symbol went. As math datatype isn't of much use in many context, I don't think we should replace this. --- Jura 10:38, 28 March 2020 (UTC)

Hello @Jura1: Please see values of P7973, many of which can't be entered correctly in P416:

select ?item (sample(?label) as ?label) (sample(?symbol) as ?symbol) where {
  ?item wdt:P7973 ?symbol .
  ?item rdfs:label ?label . filter (lang(?label) = "en")
} group by ?item

Try it!

This should clearly demonstrate the utility of P7973. Toni 001 (talk) 10:49, 28 March 2020 (UTC)

There are still cases where this isn't needed at all.

The problem is that users can't really extract those reliably from Wikidata with the usual tools. Handling of math datatype at Wikidata is a bit like PDFs at some places.

An alternate solution could be to add TeX string (P1993) as qualifier to quantity symbol (LaTeX) (P7973). --- Jura 10:55, 28 March 2020 (UTC)

@Jura1: There are currently 16 properties with math datatype. Are you suggesting that for each of the we maintain a "shadow property" with string datatype? Toni 001 (talk) 10:59, 28 March 2020 (UTC)

I think each needs to be looked at. At some point, math datatype is the only datatype where the number of statements actually decreased. --- Jura 11:01, 28 March 2020 (UTC)

In this case the use of P7973 (math datatype) in only ever going to increase. There the utility of P416 (string datatype) is limited by what can be expressed using Unicode. To not confuse users, P416 should not stand there un-qualified, but it should be reflected in the label that this is not the "main" property for expressing symbols. If you are opposed to "DEPRECATED", then at least we could indicate the datatype in the label. Toni 001 (talk) 13:37, 28 March 2020 (UTC)

Sure np. Maybe it's even better to make this a qualifier of quantity symbol (LaTeX) (P7973). --- Jura 13:45, 28 March 2020 (UTC)

I hesitate a bit on that last point. Maybe for existing users not. --- Jura 13:47, 28 March 2020 (UTC)