| Type |  | Name |  | Summary | 
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| Function |  | Tan |  | The Tangent of a number | 
| Type |  | TBits |  | An object that can hold an infinite number of Boolean values | 
| Variable |  | TConvFamily |  | Defines a family of measurement types as used by Convert | 
| Type |  | TConvType |  | Defines a measurement type as used by Convert | 
| Type |  | TDateTime |  | Data type holding a date and time value | 
| Type |  | Text |  | Defines a file as a text file | 
| Type |  | TextFile |  | Declares a file type for storing lines of text | 
| Type |  | TFloatFormat |  | Formats for use in floating point number display functions | 
| Type |  | TFormatSettings |  | A record for holding locale values for thread-safe functions | 
| Keyword |  | Then |  | Part of an if statement - starts the true clause | 
| Variable |  | ThousandSeparator |  | The character used to display the thousands separator | 
| Keyword |  | ThreadVar |  | Defines variables that are given separate instances per thread | 
| Function |  | Time |  | Gives the current time | 
| Variable |  | TimeAMString |  | Determines AM value in DateTimeToString procedure | 
| Variable |  | TimePMString |  | Determines PM value in DateTimeToString procedure | 
| Variable |  | TimeSeparator |  | The character used to separate display time fields | 
| Function |  | TimeToStr |  | Converts a TDateTime time value to a string | 
| Type |  | TList |  | General purpose container of a list of objects | 
| Keyword |  | To |  | Prefixes an incremental for loop target value | 
| Type |  | TObject |  | The base class type that is ancestor to all other classes | 
| Function |  | Tomorrow |  | Gives the date tomorrow | 
| Type |  | TOpenDialog |  | Displays a file selection dialog | 
| Type |  | TPoint |  | Holds X and Y integer values | 
| Type |  | TPrintDialog |  | Class that creates a printer selection and control dialog | 
| Type |  | TRect |  | Holds rectangle coordinate values | 
| Type |  | TReplaceFlags |  | Defines options for the StringReplace routine | 
| Function |  | Trim |  | Removes leading and trailing blanks from a string | 
| Function |  | TrimLeft |  | Removes leading blanks from a string | 
| Function |  | TrimRight |  | Removes trailing blanks from a string | 
| Function |  | Trunc |  | The integer part of a floating point number | 
| Procedure |  | Truncate |  | Truncates a file size - removes all data after the current position | 
| Keyword |  | Try |  | Starts code that has error trapping | 
| Type |  | TSaveDialog |  | Displays a dialog for selecting a save file name | 
| Type |  | TSearchRec |  | Record used to hold data for FindFirst and FindNext | 
| Type |  | TStringList |  | Holds a variable length list of strings | 
| Type |  | TSysCharSet |  | Characters used by supplied string parsing functions | 
| Type |  | TThreadFunc |  | Defines the function to be called by BeginThread | 
| Variable |  | TwoDigitYearCenturyWindow |  | Sets the century threshold for 2 digit year string conversions | 
| Keyword |  | Type |  | Defines a new category of variable or process | 
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