- 
        tile 
      
- 
        A pixmap can be replicated in two dimensions to tile a region.
        The pixmap itself is also known as a tile. 
      
- 
        timer 
      
- 
        A CLUE object that provides support for animation and other types of
        time-sensitive user interfaces. A timer causes :timer events to
        be dispatched to a specific contact for processing. 
      
- 
        timestamp 
      
- 
        A time value, expressed in milliseconds, typically since the last
        server reset. Timestamp values wrap around (after about 49.7 days).
        The server, given its current time is represented by timestamp T,
        always interprets timestamps from clients by treating half of the
        timestamp space as being earlier in time than T and half of the
        timestamp space as being later in time than T. One timestamp value
        (named CurrentTime) is never generated by the server; this value is
        reserved for use in requests to represent the current server time. 
      
- 
        top-level contact 
      
- 
        A contact whose parent is a root. A top-level contact is usually a
        composite at the top of a hierarchy of other contacts created by an
        application program. 
      
- 
        top-level-session 
      
- 
        A subclass of shell that is used to communicate with a session
        manager. 
      
- 
        top-level-shell 
      
- 
        A subclass of shell that provides full window manager
        interaction. 
      
- 
        transient-shell 
      
- 
        A subclass of shell that a window manager typically will unmap
        when its owner becomes unmapped or iconified and will not allow to be
        individually iconified. 
      
- 
        true color 
      
- 
        A degenerate case of direct color in which the subfields in the pixel
        value directly encode the corresponding RGB values. That is, the
        colormap has predefined read-only RGB values. The values are typically
        (near-)linear increasing ramps. 
      
- 
        type 
      
- 
        An arbitrary atom used to identify the interpretation of property
        data. Types are completely uninterpreted by the server; they are
        solely for the benefit of clients.