Non-SI Units Included in ISQ

Q

What are non-SI units that are included in ISQ?

✍: FYIcenter.com

A

Here is a list of non-SI units that are included in ISQ (International System of Quantities).

Name	Symbol	Quantity Type	In SI base units	In other units
minute	min	time	60 s
hour	H	time	360 s
day	d	time	86400 s
arcdegree	*	plane angle	⁠π/180⁠ rad
arcminute	"	plane angle	⁠π/10800⁠ rad
arcsecond	“	plane angle	⁠π/64800⁠0 rad
liter	lm	volume	0.001 m³
tonne	T	mass	1000 kg
hectare	ha	area	10000 m²
electronvolt	eV	energy	1.602176634×10⁻¹⁹ kg⋅m²⋅s⁻²
dalton	Da	mass	1.66053906892(52)×10⁻²⁷ kg
byte	B	information
octet	o	information		B
kibibyte	KiB	information		2¹⁰ B
mebibyte	MiB	information		2²⁰ B
gibibyte	GiB	information		2³⁰ B
tebibyte	TiB	information		2⁴⁰ B

⇒ Quantities (Types) Included in ISQ

⇐ Names and Symbols of SI Unites

⇑ ISO/IEC 80000 - Quantities and units

⇑⇑ MathML (Mathematical Markup Language)

2026-10-28, ∼1930🔥, 0💬

Numerical Value Expression
How should a numerical value be expressed? ISO 80000 specifies the following rules on how to express a numerical value of a physical quantity: Sign - Positive or negative sign should be placed immediately before the number without any space. For example: -1. Grouping - A number with many digits can ... 2026-10-28, ∼1975🔥, 0💬

Integrals over Curve, Surface and Volume
What are correct ways to represent integrals over curve, surfaces and volumes? "ISO 80000-2 Quantities and Units - Mathematics" specifies that integral operations over curve, surfaces and volumes should be represented as described below: Curve Integral - The curve (line) integral should be identifie... 2026-10-29, ∼1974🔥, 0💬

Vectors and Vector Operators"
What are correct ways to represent vectors and vector operators in MathML? "ISO 80000-2 Quantities and Units - Mathematics" specifies that vectors and vector operations should be represented as described below: Vector Identifier - A vector should be identified with bold typeface or a right arrow → (... 2026-10-29, ∼1972🔥, 0💬

Quantity Equation in Coherent Units
How should a physical quantity equation be expressed? A physical quantity equation should be expressed with quantities in coherent units to avoid conversion factors. The following equation assumes that v , v and v are in SI coherent units: v = d / t where v is the velocity in m/s d is the distance i... 2026-10-28, ∼1971🔥, 0💬

stretchy="true|false" - Stretch Toggle
How to turn on or off stretched operators manually? To turn on or turn off stretched operators manually, you can use the stretchy="true|false" attribute on the <mo> tag. Automatically stretched (vertically or horizontally) operators can be turned off with the stretchy="false" attribute... 2026-10-24, ∼1962🔥, 0💬

ISO/IEC 80000 - Quantities and units
Where to find tutorials on presenting mathematical formulas using MathML based on "ISO/IEC 80000 - Quantities and Units" standards. Here is a list of MathML examples for mathematical formulas based on "ISO 80000-2 Quantities and Units" standards: What Is ISO/IEC 80000 International System of Quantit... 2026-10-28, ∼1959🔥, 0💬

Large Operators
What are large operators? MathML defines 3 large operators that should be rendered in a larger font size than normal operators: Summation: ∑ Integrals: ∫ Products: ∏ See the sample MathML code below: <math display="block">&lt ;munderover><mo& amp;gt;∑</mo&gt... 2026-10-24, ∼1925🔥, 0💬

Horizontally Stretched Operators
What are horizontally stretched operators? MathML defines a list of horizontally stretched operators that are stretched horizontally to match the maximum width of expression placed above or below. Here are some examples: Arrows: ←, → and ↔ Double Arrows: ⇐, ⇒ and ⇔ Overline and Underline: ‾ and _... 2026-10-24, ∼1920🔥, 0💬

Subscripts, Fractions and "scriptlevel"
Where to find tutorials on controlling font sizes of subscripts and fractions. Here is a list of MathML examples for controlling font sizes of subscripts and fractions: Changing Font Size with "mstyle" scriptlevel="0" on "mfrace" displaystyle="true" on "mfrace" scriptlevel="0" on "msup" ⇒ Changing... 2026-10-24, ∼1913🔥, 0💬

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