A "twip" is a unit of measurement used in desktop publishing and computer graphics, especially in the context of Microsoft Windows. The term "twip" is an abbreviation for "twentieth of a point," and it is used to define very small distances and sizes.
In the twip system:
1 twip is equal to 1/20th of a point. 1 point (abbreviated as "pt") is equal to approximately 20 twips.
Because a point is roughly 1/72nd of an inch, 1 twip is approximately 1/1440th of an inch (or about 1/567 millimeters).
Twips are used in various applications, including word processing, graphics design, and layout software. They are particularly valuable for precise positioning and sizing of elements on a computer screen or when preparing documents for printing. The twip system is commonly used in Microsoft Windows-based applications and the Windows Graphics Device Interface (GDI).
For example, in Microsoft Word, you can set paragraph spacing or element positioning in twips to achieve fine control over the layout of your documents.
A "centiinch" is not a standard or widely recognized unit of measurement. In the International System of Units (SI), length is typically measured in meters and its subunits, such as centimeters (1 meter = 100 centimeters) and millimeters (1 meter = 1,000 millimeters).
The term "centiinch" appears to be a combination of two different measurement systems. "Centi-" is a prefix used in the metric system to denote a factor of 1/100, while "inch" is a unit of length in the imperial system commonly used in the United States and some other countries.
If someone is using the term "centiinch," it may be intended as a humorous or informal way to express a very small length in a mixed-unit fashion, but it is not part of any standard or recognized system of measurement. To avoid confusion, it's generally best to use established units like centimeters or millimeters when measuring small lengths in the metric system, or inches when using the imperial system.