Datum Feature Symbol
A datum feature symbol consists of a marker, leader, and datum reference letter.
 
1.
Click the Datum Feature Symbol tool from the Dims/Notes tool set.
2.
If this is the first time the object has been inserted in this session, the Object Properties dialog box opens. If the Attributes palette has not been set to use end markers, select the marker style, size, and angle from the Object Properties dialog box.
3.
Once the datum feature symbol has been placed, its marker can be selected from the Attributes palette (see Marker Attributes).

Drawing Notation : Dimensioning and Tolerancing : Datum Feature Symbol

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