Miscellaneous Technical

Block from U+2300 to U+23FF. This block was introduced in Unicode version 1.1 (1993). It contains 251 codepoints.

The Wikipedia provides the following information on block Miscellaneous Technical:

Miscellaneous Technical is the name of a Unicode block ranging from U+2300 to U+23FF, which contains various common symbols which are related to and used in the various technical, programming language, and academic professions.

• Symbol ⌂ (HTML hexadecimal code is ⌂) represents a house or a home.
• Symbol ⌘ (⌘) represents the Command key on Mac keyboard.
• Symbol ⌚ (⌚) is a watch (or clock).
• Symbol ⏏ (⏏) is the "Eject" button symbol found on electronic equipment.
• Symbol ⏚ (⏚) is the "Earth Ground" symbol found on electrical or electronic manual, tag and equipment.

It also includes most of the uncommon symbols used by the APL programming language.

Chart at Unicode.org (PDF)
Block at Decode Unicode