incr Tcl (commonly stylised as ''
ncr Tcl NCR may refer to:
* NCR Corporation, formerly National Cash Register
* "No carbon required" carbonless copy paper
* A Nature Conservation Review, UK book
* Naval Construction Regiment of US Navy Seabees
* New Carrollton station Amtrak code
* Not cr ...
/nowiki>'', and often abbreviated to ''itcl'') is a set of object-oriented
Object-oriented programming (OOP) is a programming paradigm based on the concept of "objects", which can contain data and code. The data is in the form of fields (often known as attributes or ''properties''), and the code is in the form of pro ...
extensions for the Tcl programming language. It is widely used among the Tcl community, and is generally regarded as