The following symbols are used to denote the most common
dimension errors. This does not mean that the instructor
has marked or found all errors on the preliminary drawing.

Some errors may be missed in marking the drafts. IT IS THE 
STUDENT'S RESPONSIBILITY TO VERIFY THAT EVERY DESIGN INTENT 
DIMENSION, AND NO OTHER, IS IN THE VERSION TO BE GRADED !

Symbols Used for Dimension Revisions on Solid Part Drawing:
Arrow	  Move dimension to noted location
Circle 	  Marks crossing leaders, dimensions, or arrows
Triangle  Error in the part and/or dimension *****
A>, A<	  Increase/decrease arrow size (Options)
AF	  Scale arrow to font size (Options)
AI	  Place arrows inside leader lines (unless overlap)
AL	  Aline chained dimensions to be collinear
AO        Move overlapping arrows to outside the leaders
A3        Align the three standard views (usually in LLC)
CD        Chain together dimensions to become collinear
CN	  Center dimension number between arrowheads
D>, D<	  Increase/decrease number of displayed digits
DD        Put dimension one font height away from dimension
DP        Put dimension one font height away from part
Dup	  Duplicate dimension, keep only the true shape one
FD	  Avoid dimension to a fillet edge
F>, F<	  Increase/decrease font size (Options)
HD	  Avoid dimension to hidden line 
HL	  Hide this reference line, plane or sketch
LT	  Line goes through text or dimension value ****
MA        Missing auxilary view
MD	  One or more design intent dimension is missing
MS        Missing section view
NDI	  Dimension not design intent, *** delete it ***
NH	  No hidden lines in this view
OB	  Move dimension off the body
RH        Radius and diameter should not be horiz or vert
S>, S<	  Increase/decrease view scale size
SH	  Show hidden lines in this view
SL	  Small dimension crosses large dimension
TS        Move this dimension to a true shape view

Include hiddden lines except in isometric and section views,
unless they cause major clutter.

Detail views should enlarge small features in a true shape
view.