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With no central authority to dictate the rules for abbreviations, various publishing houses and standards bodies have their own rules that dictate whether to use upper-case letters, lower-case letters, periods and so on, reflecting both changes in fashion and the image of the publishing house concerned
require "kph".
In informal Australian usage, km/h is more commonly pronounced "kays" or "kays an hour".{{fact|date=May 2024}} In military usage, "klicks" is used, though written as km/h.<ref>{{cite web |date=June 2012 |url=http://www.oed.com/view/Entry/241046 |title=klick |work=[[Oxford English Dictionary]] |access-date=9 July 2012}}</ref>
===Unit symbols===
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SI, and hence the use of {{nowrap|"km/h"}} (or {{nowrap|"km h<sup>−1</sup>"}} or {{nowrap|"km·h<sup>−1</sup>"}}) has now been adopted around the world in many areas related to health and safety<ref>{{cite web |url=http://intralibrary.rlo-cetl.ac.uk:8080/intralibrary/open_virtual_file_path/i1405n24399t/2.html |title=RLO: SI Units |access-date=21 July 2012 |publisher=School of Nursing and Academic Division of Midwifery; University of Nottingham |date=1 December 2006 |url-status=dead |archive-url=https://archive.today/20121223075728/http://intralibrary.rlo-cetl.ac.uk:8080/intralibrary/open_virtual_file_path/i1405n24399t/2.html |archive-date=23 December 2012 }}</ref> and in [[metrology]]<ref>{{cite web |title=Information and Harmonization |url=http://www.metrologyinfo.org/oiml-2.html |publisher=[[International Bureau of Weights and Measures]] and [[International Organization of Legal Metrology]] |access-date=20 July 2012}}</ref> in addition to the SI unit [[metres per second]] ({{nowrap|"m/s"}}, {{nowrap|"m s<sup>−1</sup>"}} or {{nowrap|"m·s<sup>−1</sup>"}}). SI is also the preferred system of measure in academia and in education.<ref>{{cite journal |url=https://www.tru.ca/library/pdf/tru-ol_editorial_style.pdf |title=OLA Editorial Style Guide |publisher=[[Open Learning Agency]] (OLA), Government of British Columbia |year=2000 |location=Burnaby, British Columbia |access-date=26 July 2012}}</ref>
===
* '''km/j''' or '''km/jam''' (Indonesia and Malaysia)
* '''km/t''' or '''km/tim''' (Norway, Denmark and Sweden; also use '''km/h''')
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* '''كم/س''' or '''كم/ساعة''' ([[Arabic-speaking countries]], also use '''km/h''')
* '''קמ"ש''' (Israel)
* '''км/ч''' (Russia and Belarus in a Russian-language context)
* '''км/г''' (Belarus in a Belarusian-language context)
* '''км/год''' (Ukraine)
* '''km/st''' (Azerbaijan)
* '''km/godz''' (Poland)
== Regulatory use ==
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