These are the drawing parameters (most common)as explained in PTC Help files.
¤t_sheet
Displays a drawing label indicating the current sheet number.
&det_scale
Displays a drawing label indicating the scale of a detailed view. You cannot use this parameter in a drawing note. Pro/ENGINEER creates this parameter with a view and places it in notes automatically. You can modify its value, but you cannot call it out in another note.
&dtm_name
Displays datum names in a drawing note, where name is the name of a datum plane. The datum name in the note is read-only, so you cannot modify it; unlike dimensions, a datum name does not disappear from the model view if included in a note. The system encloses its name in a rectangle, as if it were a set datum.
&dwg_name
Displays a drawing label indicating the name of the drawing.
&format
Displays a drawing label indicating the format size (for example, A1, A0, A, B, and so forth).
&model_name
Displays a drawing label indicating the name of the model used for the drawing.
&scale
Displays a drawing label indicating the scale of the drawing.
&todays_date
Displays a drawing label indicating the date on which the note was created in the form dd-mm-yy (for example, 2-Jan-92). You can edit it as any other nonparametric note, using Text Line or Full Note.
If you include this symbol in a format table, the system evaluates it when it copies the format into the drawing.
To specify the initial display of the date in a drawing, use the configuration file option "todays_date_note_format."
&total_sheets
Displays a drawing label indicating the total number of sheets in the drawing.
&type
Displays a drawing label indicating the drawing model type (for example, part, assembly, etc.).
&view_name
Displays a drawing label indicating the name of the view. You cannot use this parameter in a drawing note. Pro/ENGINEER creates it with a view and places it in notes automatically. You can modify its value, but you cannot call it out in another note.
&view_scale
Displays a drawing label indicating the name of a general scaled view. You cannot use this parameter in a drawing note. Pro/ENGINEER creates it with a view and places it in notes automatically. You can modify its value, but you cannot call it out in another note.
Have fun