Editing Inverter (logic gate) (section)

==Symbols==
<div class=skin-invert-image>
{{multiple image
 | image1 = Not-gate-en.svg
 | alt1 = Triangular not gate symbol
 | caption1 = Traditional NOT gate symbol; sometimes the triangle is omitted, or the circle may be placed on the input line<ref name="Broesch2012" />
 | image2 = IEC NOT.svg
 | alt2 = Rectangular not gate symbol
 | caption2 = [[List of IEC standards#60617|IEC 60617]] NOT gate symbol
}}
</div>
The traditional symbol for an inverter circuit is a triangle touching a small circle or "bubble". Input and output lines are attached to the symbol; the bubble is typically attached to the output line. To symbolize [[Logic level#2-level logic|active-low input]], sometimes the bubble is instead placed on the input line.<ref name="ElectronicsTutorials">{{cite web |title=Logic NOT Gate Tutorial |website=Electronics Tutorials |date=20 August 2013 |url=https://www.electronics-tutorials.ws/logic/logic_4.html}}</ref> Sometimes only the circle portion of the symbol is used, and it is attached to the input or output of another gate; the symbols for [[NAND gate|NAND]] and [[NOR gate|NOR]] are formed in this way.<ref name="Broesch2012" />

A bar or [[overline]] ( ‾ ) above a variable can denote negation (or inversion or complement) performed by a NOT gate.<ref name="ElectronicsTutorials" /> A slash (/) before the variable is also used.<ref name="Broesch2012" />