Ref usually means that this dimension (and any associated tolerancing), is specified somewhere else, possibly on a lower level sub-assembly drawing.
Do you mean a drawing "pen?"
its the ref no.
when you do a drawing using only lines
Contour drawing is drawing the outline shape of an object. Composition is the arrangement and organization of the artwork using the elements of art.
observing something
may be it ref no of engine in short it use for ref on production of engine
l'Ecosse - Scotland
drawing on a computer
Drafting means actually drawing the drawing.
Do you mean a drawing "pen?"
Drawing a spade or club.
Look it up on the computer
order referees so u can love them with all your heart
its the ref no.
you doodle
dibujo
drawing