Tech Terms | Abbreviations A–Z


Hamburger Button, Hamburger Menu, HD Voice, HiFi, HSTS, Hygiene

Hamburger Button

The hamburger button, so named for its unintentional resemblance to a hamburger, is a button typically placed in a top corner of a graphical user interface. Its function is to toggle a menu (sometimes referred to as a hamburger menu) or navigation bar between being collapsed behind the button or displayed on the screen. The icon which is associated with this widget, consisting of three horizontal bars, is also known as the collapsed menu icon.


Original Design

The icon was originally designed by Norm Cox as part of the user interface for the Xerox Star, introduced in 1981; it saw a resurgence starting in 2009 stemming from the limited screen area available to mobile apps. Cox described the icon's creation, saying “Its graphic design was meant to be very “road sign” simple, functionally memorable, and mimic the look of the resulting displayed menu list. With so few pixels to work with, it had to be very distinct, yet simple. I think we only had 16×16 pixels to render the image. (or possibly 13×13... can't remember exactly).”

In Mainstream Computing

In possibly its first use after the Xerox Star, the release of Windows 1.0 in 1985 contained a hamburger icon in each window's control menu. It was short-lived, however, as the hamburger icon disappeared in Windows 2.0 in favor of a single horizontal line denoting the control menu. Windows 95 replaced the single line with the program's icon, and the hamburger would not return to Windows until a placement on the Start menu of the one-year update of Windows 10.

Appearance and Functionality

A hamburger menu in a previous version of the Wikipedia mobile app

The "menu" button takes the form of an icon that consists of three parallel horizontal lines (displayed as ), suggestive of a list. The name refers to its resemblance to the menu that is typically exposed or opened when interacting with it. The wider button may be reduced to three vertically stacked dots (displayed as a tri-colon or vertical ellipsis  ), also known as a kebab iconmeatball icon or falafel icon. In the Microsoft Office 365 platform, a similar application menu consisting of three rows of three squares is displayed. Tapping, clicking or otherwise activating this button results in a menu being revealed, which distinguishes it from a menu or tab bar that is always on display.



It has been argued that while the collapsed menu button is now commonplace, its functionality is not necessarily immediately obvious when first encountered; in particular, older users less familiar with modern iconography may find it confusing.


The menu button may increase interaction cost compared to a bottom bar menu, requiring extra clicks to retrieve the same information, albeit with the benefit of less space usage of the screen, in the context of mobile apps. It has also been argued that designers tend to overload these icons with too much hidden information.

This article is based on the article Hamburger_button from the free encyclopedia Wikipedia and is licensed under Creative Commons CC-BY-SA 3.0 Unported (short version). A list of authors is available in Wikipedia.

Hamburger Menu

Space-saving way of showing a selection menu only when needed to keep the limited space on small displays free for the actual page content and to distract less from the content. Only after tapping/clicking the Hamburger Button explained in the paragraph above does it unfold the menu and then covers part of the page content on small displays. After selecting a menu item, the hamburger menu disappears again.

HD Voice

Wideband audio better known as Adaptive Multi-Rate Wideband (AMR-WB) or HD Voice. HD Voice provides improved speech quality due to a wider speech bandwidth for phone calls via landline and 3G/4G mobile phones.

HiFi (abbr.): High Fidelity

Natural sound as possible on a high-end device e.g. entertainment cabinet, loudspeaker box, headphones, mobile phone or MP3 Player.

HSTS (abbr.): HTTP Strict Transport Security

is a web security policy mechanism that helps to protect websites against protocol downgrade attacks and cookie hijacking. It allows web servers to declare that web browsers (or other complying user agents) should interact with it using only HTTPS connections, which provide Transport Layer Security (TLS/SSL), unlike the insecure HTTP used alone. HSTS is an IETF standards track protocol and is specified in RFC 6797.

The HSTS Policy is communicated by the server to the user agent via an HTTPS response header field named "Strict-Transport-Security". HSTS Policy specifies a period of time during which the user agent should only access the server in a secure fashion. Websites using HSTS often do not accept clear text HTTP, either by rejecting connections over HTTP or systematically redirecting users to HTTPS (though this is not required by the specification). The consequence of this is that a user-agent not capable of doing TLS will not be able to connect to the site.

This article is based on the article HTTP_Strict_Transport_Security from the free encyclopedia Wikipedia and is licensed under Creative Commons CC-BY-SA 3.0 Unported (short version). A list of authors is available in Wikipedia.


is a series of practices performed to preserve health. According to the World Health Organization (WHO), "Hygiene refers to conditions and practices that help to maintain health and prevent the spread of diseases." Personal hygiene refers to maintaining the body's cleanliness.

Many people equate hygiene with 'cleanliness,' but hygiene is a broad term. It includes such personal habit choices as how frequently to take a shower or bath, wash hands, trim fingernails, and wash clothes. It also includes attention to keeping surfaces in the home and workplace, including bathroom facilities, clean and pathogen-free.

Some regular hygiene practices may be considered good habits by the society, while the neglect of hygiene can be considered disgusting, disrespectful, or threatening.


First attested in English in 1676, the word hygiene comes from the French hygiène, the latinisation of the Greek ὑγιεινή (τέχνη) hygieinē technē, meaning "(art) of health", from ὑγιεινός hygieinos, "good for the health, healthy", in turn from ὑγιής (hygiēs), "healthful, sound, salutary, wholesome". In ancient Greek religionHygeia (Ὑγίεια) was the personification of health, cleanliness, and hygiene.


Washing one's hands, a form of hygiene, is the most effective way to prevent the spread of infectious diseases

Astronaut taking a hot bath in the crew quarters of the Orbital Workshop (OWS) of the Skylab space station cluster in Earth orbit. In deploying the shower facility the shower curtain is pulled up from the floor and attached to the ceiling. The water comes through a push-button shower head attached to a flexible hose. Water is drawn off by a vacuum system.

Hygiene is a concept related to cleanliness, health and medicine. It is as well related to personal and professional care practices. In medicine and everyday life settings, hygiene practices are employed as preventive measures to reduce the incidence and spreading of disease.

Hygiene practices vary, and what is considered acceptable in one culture might not be acceptable in another.

In the manufacturing of food, pharmaceutical, cosmetic and other products, good hygiene is a critical component of quality assurance.

The terms cleanliness and hygiene are often used interchangeably, which can cause confusion. In general, hygiene refers to practices that prevent spread of disease-causing organisms. Cleaning processes (e.g., handwashing) remove infectious microbes as well as dirt and soil, and are thus often the means to achieve hygiene.

Other uses of the term appear in phrases including body hygiene, personal hygiene, sleep hygienemental hygienedental hygiene, and occupational hygiene, used in connection with public healthHygiene is also the name of a branch of science that deals with the promotion and preservation of health.

Medical hygiene

Medical hygiene pertains to the hygiene practices related to the administration of medicine and medical care that prevents or minimizes the spread of disease.

Medical hygiene practices include:

Most of these practices were developed in the 19th century and were well established by the mid-20th century. Some procedures (such as disposal of medical waste) were refined in response to late-20th century disease outbreaks, notably AIDS and Ebola.

This article is based on the article Hygiene from the free encyclopedia Wikipedia and is licensed under Creative Commons CC-BY-SA 3.0 Unported (short version). A list of authors is available in Wikipedia.

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