A secure unit is an establishment where you are locked in, or prevented from leaving. It provides a secure accommodation, education, training, psychiatric help etc for offenders and people who are mentally ill.
to be honest mechanically secure is
The same units as the mean itself. If the units of the mean, are, for example miles; then the error units are miles.
Secure Digital
what do you mean by input/ouput units?
An "SD card" is a Secure Digital memory card.
International System of Units
There are several US companies that specialise in self storage units. Nationwide companies include US Storage Centers and Public Storage which both offer different sized units, well priced packages and secure locked facilities.
dhh
to firmly secure something
yep. sure.
Secure employees and properties
Secure and Immovable