The following units are in the Units package.

An asterisk ( * ) indicates the default context, an at sign (@) indicates an abbreviation, and under the prefixes column, SI indicates that the unit takes all SI prefixes, IEC indicates that the unit takes IEC prefixes, and SI+ and SI- indicate that the unit takes only positive and negative SI prefixes, respectively.  Refer to a unit in the Units package by indexing the name or symbol with the context, for example, brewster[standard]; or, if the context is indicated as the default, by using only the unit name or symbol, for example, brewster.

The units are defined as follows.

A brewster has the dimension length time squared per mass. It is defined as a square micrometer per newton.

A talbot has the dimension luminous flux time. It is defined as a lumen second.  It is also known as a lumberg.

A strontium unit has the dimension inverse time mass. It is defined as $37$ becquerels per kilogram.

$\mathrm{convert}\left('\mathrm{brewster}'\,'\mathrm{dimensions}'\,'\mathrm{base}'\right)$

$\frac{\mathrm{length}{\mathrm{time}}^2}{\mathrm{mass}}$

$\mathrm{convert}\left(1\,'\mathrm{units}'\,'\mathrm{brewster}'\,\frac{'m'{'s'}^2}{'\mathrm{kg}'}\right)$

$\frac{1}{1000000000000}$

$\mathrm{convert}\left('\mathrm{talbot}'\,'\mathrm{dimensions}'\,'\mathrm{base}'\right)$

$\frac{\mathrm{luminous\_intensity}{\mathrm{length}}^2\mathrm{time}}{{\mathrm{length}\left(\mathrm{radius}\right)}^2}$

$\mathrm{convert}\left(1\,'\mathrm{units}'\,'\mathrm{talbot}'\,'\mathrm{lm}''s'\right)$

$1$

$\mathrm{convert}\left('\mathrm{strontium\_unit}'\,'\mathrm{dimensions}'\,'\mathrm{base}'\right)$

$\frac{1}{\mathrm{time}\mathrm{mass}}$

$\mathrm{convert}\left(1\,'\mathrm{units}'\,'\mathrm{strontium\_unit}'\,\frac{'\mathrm{Bq}'}{'\mathrm{kg}'}\right)$

$37$